Index: wp-admin/css/ie.css
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-admin/css/ie.css	(revision 29251)
+++ wp-admin/css/ie.css	(revision )
@@ -152,10 +152,6 @@
 	margin-bottom: -2px;
 }
 
-#adminmenu .wp-menu-arrow {
-	display: none !important;
-}
-
 .js.folded #adminmenu li.menu-top {
 	display: block;
 	zoom: 100%;
Index: wp-admin/css/ie-rtl.css
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-admin/css/ie-rtl.css	(revision 29251)
+++ wp-admin/css/ie-rtl.css	(revision )
@@ -152,9 +152,6 @@
 	margin-bottom: -2px;
 }
 
-#adminmenu .wp-menu-arrow {
-	display: none !important;
-}
 
 .js.folded #adminmenu li.menu-top {
 	display: block;
@@ -272,10 +269,6 @@
 #editcat,
 #addcat {
 	zoom: 100%;
-}
-
-.wp-menu-arrow {
-	height: 28px;
 }
 
 .submitbox {
Index: wp-admin/css/admin-menu-rtl.css
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-admin/css/admin-menu-rtl.css	(revision 29251)
+++ wp-admin/css/admin-menu-rtl.css	(revision )
@@ -248,9 +248,7 @@
 #adminmenu li.current a.menu-top,
 .folded #adminmenu li.wp-has-current-submenu,
 .folded #adminmenu li.current.menu-top,
-#adminmenu .wp-menu-arrow,
-#adminmenu .wp-has-current-submenu .wp-submenu .wp-submenu-head,
-#adminmenu .wp-menu-arrow div {
+#adminmenu .wp-has-current-submenu .wp-submenu .wp-submenu-head {
 	background: #0074a2;
 	color: #fff;
 }
Index: wp-admin/css/common-rtl.css
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-admin/css/common-rtl.css	(revision 29251)
+++ wp-admin/css/common-rtl.css	(revision )
@@ -1327,7 +1327,7 @@
 
 #contextual-help-wrap {
 	overflow: auto;
-	margin-right: 0 !important;
+	margin-right: 0;
 }
 
 #screen-meta .screen-reader-text {
@@ -1412,7 +1412,7 @@
 	vertical-align: bottom;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
-	text-decoration: none !important;
+	text-decoration: none;
 	color: #bbb;
 }
 
Index: wp-admin/menu-header.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-admin/menu-header.php	(revision 29251)
+++ wp-admin/menu-header.php	(revision )
@@ -100,7 +100,6 @@
 				$img_class = ' dashicons-before ' . sanitize_html_class( $item[6] );
 			}
 		}
-		$arrow = '<div class="wp-menu-arrow"><div></div></div>';
 
 		$title = wptexturize( $item[0] );
 
@@ -116,9 +115,9 @@
 				$menu_file = substr( $menu_file, 0, $pos );
 			if ( ! empty( $menu_hook ) || ( ( 'index.php' != $submenu_items[0][2] ) && file_exists( WP_PLUGIN_DIR . "/$menu_file" ) && ! file_exists( ABSPATH . "/wp-admin/$menu_file" ) ) ) {
 				$admin_is_parent = true;
-				echo "<a href='admin.php?page={$submenu_items[0][2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>$title</div></a>";
+				echo "<a href='admin.php?page={$submenu_items[0][2]}'$class $aria_attributes><div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>$title</div></a>";
 			} else {
-				echo "\n\t<a href='{$submenu_items[0][2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>$title</div></a>";
+				echo "\n\t<a href='{$submenu_items[0][2]}'$class $aria_attributes><div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>$title</div></a>";
 			}
 		} elseif ( ! empty( $item[2] ) && current_user_can( $item[1] ) ) {
 			$menu_hook = get_plugin_page_hook( $item[2], 'admin.php' );
@@ -127,9 +126,9 @@
 				$menu_file = substr( $menu_file, 0, $pos );
 			if ( ! empty( $menu_hook ) || ( ( 'index.php' != $item[2] ) && file_exists( WP_PLUGIN_DIR . "/$menu_file" ) && ! file_exists( ABSPATH . "/wp-admin/$menu_file" ) ) ) {
 				$admin_is_parent = true;
-				echo "\n\t<a href='admin.php?page={$item[2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
+				echo "\n\t<a href='admin.php?page={$item[2]}'$class $aria_attributes><div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
 			} else {
-				echo "\n\t<a href='{$item[2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
+				echo "\n\t<a href='{$item[2]}'$class $aria_attributes><div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
 			}
 		}
 
Index: wp-admin/css/admin-menu.css
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-admin/css/admin-menu.css	(revision 29251)
+++ wp-admin/css/admin-menu.css	(revision )
@@ -248,9 +248,7 @@
 #adminmenu li.current a.menu-top,
 .folded #adminmenu li.wp-has-current-submenu,
 .folded #adminmenu li.current.menu-top,
-#adminmenu .wp-menu-arrow,
-#adminmenu .wp-has-current-submenu .wp-submenu .wp-submenu-head,
-#adminmenu .wp-menu-arrow div {
+#adminmenu .wp-has-current-submenu .wp-submenu .wp-submenu-head {
 	background: #0074a2;
 	color: #fff;
 }
@@ -411,9 +409,6 @@
 
 /* A new arrow */
 
-.wp-menu-arrow {
-	display: none !important;
-}
 
 ul#adminmenu a.wp-has-current-submenu {
 	position: relative;
Index: wp-admin/css/common.css
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-admin/css/common.css	(revision 29251)
+++ wp-admin/css/common.css	(revision )
@@ -1327,7 +1327,7 @@
 
 #contextual-help-wrap {
 	overflow: auto;
-	margin-left: 0 !important;
+	margin-left: 0;
 }
 
 #screen-meta .screen-reader-text {
@@ -1412,7 +1412,7 @@
 	vertical-align: bottom;
 	-webkit-font-smoothing: antialiased;
 	-moz-osx-font-smoothing: grayscale;
-	text-decoration: none !important;
+	text-decoration: none;
 	color: #bbb;
 }