Extract minimal RenderViewHost interface for embedders, leaving

chrome/browser/ui/browser_navigator.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 "chrome/browser/ui/browser_navigator.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/stringprintf.h"
@@ skipping 511 matching lines @@
       }
     } else {
       // ... otherwise if we're loading in the current tab, the target is the
       // same as the source.
       params->target_contents = params->source_contents;
       DCHECK(params->target_contents);
     }
 
     if (user_initiated) {
       params->target_contents->web_contents()->GetRenderViewHost()->
-          delegate()->OnUserGesture();
+          GetDelegate()->OnUserGesture();
     }
 
     InitializeExtraHeaders(params, params->target_contents->profile(),
                            &extra_headers);
 
     // Try to handle non-navigational URLs that popup dialogs and such, these
     // should not actually navigate.
     if (!HandleNonNavigationAboutURL(url)) {
       // Perform the actual navigation, tracking whether it came from the
       // renderer.
@@ skipping 137 matching lines @@
       popup_bounds.height() > max_height ||
       popup_bounds.width() == 0 ||
       popup_bounds.height() == 0) {
     return NEW_FOREGROUND_TAB;
   }
   return NEW_POPUP;
 }
 #endif
 
 }  // namespace browser