DevTools: SourcesPanel: Double-click on watch expression name should start editing.

BUG=

Review URL: https://codereview.chromium.org/702603003

git-svn-id: svn://svn.chromium.org/blink/trunk@184879 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/devtools/front_end/components/ObjectPropertiesSection.js

@@ -166,7 +166,8 @@ WebInspector.ObjectPropertyTreeElement.prototype = {
      */
     ondblclick: function(event)
     {
-        if ((this.property.writable || this.property.setter) && event.target.isSelfOrDescendant(this.valueElement))
+        var editableElement = this.elementAndValueToEdit().element;
+        if ((this.property.writable || this.property.setter) && event.target.isSelfOrDescendant(editableElement))
             this.startEditing(event);
         return false;
     },