Backed out changeset 72ae3513844c (bug 1515204) for Mochitest failures in layout/base/tests/test_reftests_with_caret.html. CLOSED TREE

browser/components/customizableui/test/browser.ini

@@ -88,6 +88,7 @@ skip-if = os == "linux" # Intermittent failures
 skip-if = verify
 [browser_956602_remove_special_widget.js]
 [browser_962069_drag_to_overflow_chevron.js]
+skip-if = verify || os == "linux" || os == "mac" && debug # bug 1515204
 [browser_963639_customizing_attribute_non_customizable_toolbar.js]
 [browser_967000_button_charEncoding.js]
 [browser_968565_insert_before_hidden_items.js]

testing/mochitest/tests/SimpleTest/EventUtils.js

@@ -2337,7 +2337,6 @@ function synthesizeDropAfterDragOver(aResult, aDataTransfer, aDestElement, aDest
                                   aDataTransfer, aDragEvent);
     sendDragEvent(event, aDestElement, aDestWindow);
   }
-  synthesizeMouse(aDestElement, 2, 2, { type: "mouseup" }, aDestWindow);
 
   return effect;
 }