Move unique name generation and tracking into //content.

third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 1063 matching lines @@
   if (!isCurrentlyDisplayedInFrame())
     return nullAtom;
 
   return frame()->tree().name();
 }
 
 void LocalDOMWindow::setName(const AtomicString& name) {
   if (!isCurrentlyDisplayedInFrame())
     return;
 
+  // Avoid calling out to notify the embedder if the browsing context name
+  // didn't change. This is important to avoid violating the browser assumption
+  // that the unique name doesn't change if the browsing context name doesn't
+  // change.
+  // TODO(dcheng): This comment is indicative of a problematic layering
+  // violation. The browser should not be relying on the renderer to get this
+  // correct; unique name calculation should be moved up into the browser.
   if (name == frame()->tree().name())
     return;
 
   frame()->tree().setName(name);
   ASSERT(frame()->loader().client());
-  frame()->loader().client()->didChangeName(name, frame()->tree().uniqueName());
+  frame()->loader().client()->didChangeName(name);
 }
 
 void LocalDOMWindow::setStatus(const String& string) {
   m_status = string;
 
   if (!frame())
     return;
 
   Page* page = frame()->page();
   if (!page)
@@ skipping 552 matching lines @@
   DOMWindow::trace(visitor);
   Supplementable<LocalDOMWindow>::trace(visitor);
 }
 
 DEFINE_TRACE_WRAPPERS(LocalDOMWindow) {
   visitor->traceWrappers(m_customElements);
   DOMWindow::traceWrappers(visitor);
 }
 
 }  // namespace blink