Content size notification was only used for the Mac overlay navigation code, which no longer needs …

Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 513 matching lines @@
 {
     return m_webView->client() ? m_webView->client()->screenInfo() : WebScreenInfo();
 }
 
 void ChromeClientImpl::contentsSizeChanged(LocalFrame* frame, const IntSize& size) const
 {
     m_webView->didChangeContentsSize();
 
     WebLocalFrameImpl* webframe = WebLocalFrameImpl::fromFrame(frame);
     webframe->didChangeContentsSize(size);
-    if (webframe->client())
-        webframe->client()->didChangeContentsSize(webframe, size);
 
     frame->loader().restoreScrollPositionAndViewState();
 }
 
 void ChromeClientImpl::deviceOrPageScaleFactorChanged() const
 {
     m_webView->deviceOrPageScaleFactorChanged();
 }
 
 void ChromeClientImpl::layoutUpdated(LocalFrame* frame) const
@@ skipping 357 matching lines @@
 {
     return static_cast<NavigatorContentUtilsClient::CustomHandlersState>(m_webView->client()->isProtocolHandlerRegistered(scheme, baseURL, url));
 }
 
 void NavigatorContentUtilsClientImpl::unregisterProtocolHandler(const String& scheme, const WebCore::KURL& baseURL, const WebCore::KURL& url)
 {
     m_webView->client()->unregisterProtocolHandler(scheme, baseURL, url);
 }
 
 } // namespace blink