Index: wp-admin/users.php
===================================================================
--- wp-admin/users.php	(revision 24811)
+++ wp-admin/users.php	(working copy)
@@ -250,7 +250,7 @@
 		wp_dropdown_users( array( 'name' => 'reassign_user', 'exclude' => array_diff( $userids, array($current_user->ID) ) ) ); ?></li>
 	</ul></fieldset>
 	<input type="hidden" name="action" value="dodelete" />
-	<?php submit_button( __('Confirm Deletion'), 'secondary' ); ?>
+	<?php submit_button( __('Confirm Deletion'), '' ); ?>
 <?php else : ?>
 	<p><?php _e('There are no valid users selected for deletion.'); ?></p>
 <?php endif; ?>
@@ -344,7 +344,7 @@
  	?>
 <?php if ( $go_remove ) : ?>
 		<input type="hidden" name="action" value="doremove" />
-		<?php submit_button( __('Confirm Removal'), 'secondary' ); ?>
+		<?php submit_button( __('Confirm Removal'), '' ); ?>
 <?php else : ?>
 	<p><?php _e('There are no valid users selected for removal.'); ?></p>
 <?php endif; ?>
Index: wp-admin/includes/class-wp-media-list-table.php
===================================================================
--- wp-admin/includes/class-wp-media-list-table.php	(revision 24811)
+++ wp-admin/includes/class-wp-media-list-table.php	(working copy)
@@ -95,7 +95,7 @@
 		}
 
 		if ( $this->detached ) {
-			submit_button( __( 'Scan for lost attachments' ), 'secondary', 'find_detached', false );
+			submit_button( __( 'Scan for lost attachments' ), '', 'find_detached', false );
 		} elseif ( $this->is_trash && current_user_can( 'edit_others_posts' ) ) {
 			submit_button( __( 'Empty Trash' ), 'apply', 'delete_all', false );
 		} ?>
Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php	(revision 24811)
+++ wp-admin/includes/template.php	(working copy)
@@ -554,7 +554,7 @@
 
 <tr><td colspan="2">
 <div class="submit">
-<?php submit_button( __( 'Add Custom Field' ), 'secondary', 'addmeta', false, array( 'id' => 'newmeta-submit', 'data-wp-lists' => 'add:the-list:newmeta' ) ); ?>
+<?php submit_button( __( 'Add Custom Field' ), '', 'addmeta', false, array( 'id' => 'newmeta-submit', 'data-wp-lists' => 'add:the-list:newmeta' ) ); ?>
 </div>
 <?php wp_nonce_field( 'add-meta', '_ajax_nonce-add-meta', false ); ?>
 </td></tr>
@@ -1661,8 +1661,6 @@
 	$button_shorthand = array( 'primary', 'small', 'large' );
 	$classes = array( 'button' );
 	foreach ( $type as $t ) {
-		if ( 'secondary' === $t || 'button-secondary' === $t )
-			continue;
 		$classes[] = in_array( $t, $button_shorthand ) ? 'button-' . $t : $t;
 	}
 	$class = implode( ' ', array_unique( $classes ) );
Index: wp-admin/includes/nav-menu.php
===================================================================
--- wp-admin/includes/nav-menu.php	(revision 24811)
+++ wp-admin/includes/nav-menu.php	(working copy)
@@ -725,7 +725,7 @@
 			<p class="quick-search-wrap">
 				<input type="search" class="quick-search input-with-default-title" title="<?php esc_attr_e('Search'); ?>" value="<?php echo $searched; ?>" name="quick-search-posttype-<?php echo $post_type_name; ?>" />
 				<span class="spinner"></span>
-				<?php submit_button( __( 'Search' ), 'button-small quick-search-submit button-secondary hide-if-js', 'submit', false, array( 'id' => 'submit-quick-search-posttype-' . $post_type_name ) ); ?>
+				<?php submit_button( __( 'Search' ), 'button-small quick-search-submit hide-if-js', 'submit', false, array( 'id' => 'submit-quick-search-posttype-' . $post_type_name ) ); ?>
 			</p>
 
 			<ul id="<?php echo $post_type_name; ?>-search-checklist" data-wp-lists="list:<?php echo $post_type_name?>" class="categorychecklist form-no-clear">
@@ -967,7 +967,7 @@
 			<p class="quick-search-wrap">
 				<input type="search" class="quick-search input-with-default-title" title="<?php esc_attr_e('Search'); ?>" value="<?php echo $searched; ?>" name="quick-search-taxonomy-<?php echo $taxonomy_name; ?>" />
 				<span class="spinner"></span>
-				<?php submit_button( __( 'Search' ), 'button-small quick-search-submit button-secondary hide-if-js', 'submit', false, array( 'id' => 'submit-quick-search-taxonomy-' . $taxonomy_name ) ); ?>
+				<?php submit_button( __( 'Search' ), 'button-small quick-search-submit hide-if-js', 'submit', false, array( 'id' => 'submit-quick-search-taxonomy-' . $taxonomy_name ) ); ?>
 			</p>
 
 			<ul id="<?php echo $taxonomy_name; ?>-search-checklist" data-wp-lists="list:<?php echo $taxonomy_name?>" class="categorychecklist form-no-clear">
Index: wp-admin/custom-header.php
===================================================================
--- wp-admin/custom-header.php	(revision 24811)
+++ wp-admin/custom-header.php	(working copy)
@@ -732,7 +732,7 @@
 	<?php submit_button( __( 'Crop and Publish' ), 'primary', 'submit', false ); ?>
 	<?php
 	if ( isset( $oitar ) && 1 == $oitar && ( current_theme_supports( 'custom-header', 'flex-height' ) || current_theme_supports( 'custom-header', 'flex-width' ) ) )
-		submit_button( __( 'Skip Cropping, Publish Image as Is' ), 'secondary', 'skip-cropping', false );
+		submit_button( __( 'Skip Cropping, Publish Image as Is' ), '', 'skip-cropping', false );
 	?>
 	</p>
 </form>
Index: wp-admin/themes.php
===================================================================
--- wp-admin/themes.php	(revision 24811)
+++ wp-admin/themes.php	(working copy)
@@ -260,7 +260,7 @@
 	<?php endforeach; ?>
 
 	<div class="feature-container">
-		<?php submit_button( __( 'Apply Filters' ), 'button-secondary submitter', false, false, array( 'id' => 'filter-submit' ) ); ?>
+		<?php submit_button( __( 'Apply Filters' ), 'submitter', false, false, array( 'id' => 'filter-submit' ) ); ?>
 		&nbsp;
 		<a id="mini-filter-click" href="<?php echo esc_url( remove_query_arg( array('filter', 'features', 'submit') ) ); ?>"><?php _e( 'Close filters' )?></a>
 	</div>