Index: wp-includes/media.php
===================================================================
--- wp-includes/media.php	(revision 26738)
+++ wp-includes/media.php	(working copy)
@@ -220,7 +220,7 @@
  *
  * @param int $id Attachment ID.
  * @param string $alt Image Description for the alt attribute.
- * @param string $title Image Description for the title attribute.
+ * @param string $title Image Description for the title attribute. Passes empty string since 3.5.0.
  * @param string $align Part of the class name for aligning the image.
  * @param string $size Optional. Default is 'medium'.
  * @return string HTML IMG element for given image attachment
@@ -230,8 +230,6 @@
 	list( $img_src, $width, $height ) = image_downsize($id, $size);
 	$hwstring = image_hwstring($width, $height);
 
-	$title = $title ? 'title="' . esc_attr( $title ) . '" ' : '';
-
 	$class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id;
 	$class = apply_filters('get_image_tag_class', $class, $id, $align, $size);