Make a clean interface for dialog callbacks.

chrome/browser/tab_contents/background_contents.cc

 // Copyright (c) 2011 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/tab_contents/background_contents.h"
 
 #include "chrome/browser/background/background_contents_service.h"
 #include "chrome/browser/extensions/extension_message_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_preferences_util.h"
@@ skipping 132 matching lines @@
   render_view_host()->JavaScriptDialogClosed(reply_msg,
                                              success,
                                              user_input);
 }
 
 gfx::NativeWindow BackgroundContents::GetDialogRootWindow() {
   NOTIMPLEMENTED();
   return NULL;
 }
 
-TabContents* BackgroundContents::AsTabContents() {
-  return NULL;
-}
-
-ExtensionHost* BackgroundContents::AsExtensionHost() {
-  return NULL;
-}
-
 void BackgroundContents::UpdateInspectorSetting(const std::string& key,
                                          const std::string& value) {
   Profile* profile = render_view_host_->process()->profile();
   RenderViewHostDelegateHelper::UpdateInspectorSetting(profile, key, value);
 }
 
 void BackgroundContents::ClearInspectorSettings() {
   Profile* profile = render_view_host_->process()->profile();
   RenderViewHostDelegateHelper::ClearInspectorSettings(profile);
 }
@@ skipping 83 matching lines @@
 BackgroundContents*
 BackgroundContents::GetBackgroundContentsByID(int render_process_id,
                                               int render_view_id) {
   RenderViewHost* render_view_host =
       RenderViewHost::FromID(render_process_id, render_view_id);
   if (!render_view_host)
     return NULL;
 
   return render_view_host->delegate()->GetAsBackgroundContents();
 }