Pass the proper RenderFrameHost to observers.

content/browser/web_contents/web_contents_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 2792 matching lines @@
   }
 
   view_->RenderViewCreated(render_view_host);
 
   FOR_EACH_OBSERVER(
       WebContentsObserver, observers_, RenderViewCreated(render_view_host));
 
   // We tell the observers now instead of when the main RenderFrameHostImpl is
   // constructed because otherwise it would be too early (i.e. IPCs sent to the
   // frame would be dropped because it's not created yet).
-  RenderFrameHost* main_frame = GetMainFrame();
+  RenderFrameHost* main_frame = render_view_host->GetMainFrame();
   FOR_EACH_OBSERVER(
       WebContentsObserver, observers_, RenderFrameCreated(main_frame));
 }
 
 void WebContentsImpl::RenderViewReady(RenderViewHost* rvh) {
   if (rvh != GetRenderViewHost()) {
     // Don't notify the world, since this came from a renderer in the
     // background.
     return;
   }
@@ skipping 838 matching lines @@
 
 void WebContentsImpl::OnPreferredSizeChanged(const gfx::Size& old_size) {
   if (!delegate_)
     return;
   const gfx::Size new_size = GetPreferredSize();
   if (new_size != old_size)
     delegate_->UpdatePreferredSize(this, new_size);
 }
 
 }  // namespace content