Extract minimal RenderViewHost interface for embedders, leaving

chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.h"
 
 #include <utility>
 
 #include "base/memory/scoped_nsobject.h"
 #include "content/browser/renderer_host/render_view_host.h"
@@ skipping 60 matching lines @@
   // We're the current tab if we're in the view hierarchy, otherwise some other
   // tab is.
   return [[self view] superview] ? YES : NO;
 }
 
 - (void)willBecomeUnselectedTab {
   // The RWHV is ripped out of the view hierarchy on tab switches, so it never
   // formally resigns first responder status.  Handle this by explicitly sending
   // a Blur() message to the renderer, but only if the RWHV currently has focus.
   RenderViewHost* rvh = [self webContents]->GetRenderViewHost();
-  if (rvh && rvh->view() && rvh->view()->HasFocus())
+  if (rvh && rvh->GetView() && rvh->GetView()->HasFocus())
     rvh->Blur();
 }
 
 - (void)willBecomeSelectedTab {
   // Do not explicitly call Focus() here, as the RWHV may not actually have
   // focus (for example, if the omnibox has focus instead).  The TabContents
   // logic will restore focus to the appropriate view.
 }
 
 - (void)tabDidChange:(WebContents*)updatedContents {
   // Calling setContentView: here removes any first responder status
   // the view may have, so avoid changing the view hierarchy unless
   // the view is different.
   if ([self webContents] != updatedContents) {
     contents_ = updatedContents;
     [self ensureContentsVisible];
   }
 }
 
 @end