[DevTools] Cleanup DOMExtension.js.

third_party/WebKit/Source/devtools/front_end/ui/TextPrompt.js

 /*
  * Copyright (C) 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 669 matching lines @@
     isSuggestBoxVisible: function()
     {
         return this._suggestBox && this._suggestBox.visible();
     },
 
     /**
      * @return {boolean}
      */
     isCaretInsidePrompt: function()
     {
-        return this._element.isInsertionCaretInside();
+        var selection = this._element.getComponentSelection();
+        // @see crbug.com/602541
+        var selectionRange = selection && selection.rangeCount ? selection.getRangeAt(0) : null;
+        if (!selectionRange || !selection.isCollapsed)
+            return false;
+        return selectionRange.startContainer.isSelfOrDescendant(this._element);
     },
 
     /**
      * @return {boolean}
      */
     isCaretAtEndOfPrompt: function()
     {
         var selection = this._element.getComponentSelection();
         var selectionRange = selection && selection.rangeCount ? selection.getRangeAt(0) : null;
         if (!selectionRange || !selection.isCollapsed)
@@ skipping 318 matching lines @@
     },
 
     /**
      * @return {string|undefined}
      */
     _currentHistoryItem: function()
     {
         return this._data[this._data.length - this._historyOffset];
     }
 };