Remove the old didFirstVisuallyNonEmptyLayout hook.

Source/web/FrameLoaderClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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.
@@ skipping 472 matching lines @@
         m_webFrame->client()->didFinishLoad(m_webFrame);
 
     if (observer)
         observer->didFinishLoading();
 
     // Don't clear the redirect chain, this will happen in the middle of client
     // redirects, and we need the context. The chain will be cleared when the
     // provisional load succeeds or fails, not the "real" one.
 }
 
-void FrameLoaderClientImpl::dispatchDidFirstVisuallyNonEmptyLayout()
-{
-    if (m_webFrame->client())
-        m_webFrame->client()->didFirstVisuallyNonEmptyLayout(m_webFrame);
-}
-
 void FrameLoaderClientImpl::dispatchDidChangeThemeColor()
 {
     if (m_webFrame->client())
         m_webFrame->client()->didChangeThemeColor();
 }
 
 static bool allowCreatingBackgroundTabs()
 {
 
     const WebInputEvent* inputEvent = WebViewImpl::currentInputEvent();
@@ skipping 447 matching lines @@
 
 void FrameLoaderClientImpl::suddenTerminationDisablerChanged(bool present, SuddenTerminationDisablerType type)
 {
     if (m_webFrame->client()) {
         m_webFrame->client()->suddenTerminationDisablerChanged(
             present, static_cast<WebFrameClient::SuddenTerminationDisablerType>(type));
     }
 }
 
 } // namespace blink