FrameTree::Find only searches relative to local frames.

third_party/WebKit/public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 156 matching lines @@
   virtual void SetWindowFeatures(const WebWindowFeatures&) = 0;
 
   // Marks the WebView as being opened by a DOM call. This is relevant
   // for whether window.close() may be called.
   virtual void SetOpenedByDOM() = 0;
 
   // Frames --------------------------------------------------------------
 
   virtual WebFrame* MainFrame() = 0;
 
-  // Returns the frame identified by the given name.  This method
-  // supports pseudo-names like _self, _top, and _blank.  It traverses
-  // the entire frame tree containing this tree looking for a frame that
-  // matches the given name.  If the optional relativeToFrame parameter
-  // is specified, then the search begins with the given frame and its
-  // children.
-  virtual WebFrame* FindFrameByName(const WebString& name,
-                                    WebFrame* relative_to_frame = 0) = 0;
-
   // Focus ---------------------------------------------------------------
 
   virtual WebLocalFrame* FocusedFrame() = 0;
   virtual void SetFocusedFrame(WebFrame*) = 0;
 
   // Sets the provided frame as focused and fires blur/focus events on any
   // currently focused elements in old/new focused documents.  Note that this
   // is different from setFocusedFrame, which does not fire events on focused
   // elements.
   virtual void FocusDocumentView(WebFrame*) = 0;
@@ skipping 292 matching lines @@
   // completed.
   WebWidget* GetWidget() { return this; }
 
  protected:
   ~WebView() {}
 };
 
 }  // namespace blink
 
 #endif