Make a clean interface for dialog callbacks.

content/browser/tab_contents/tab_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 "content/browser/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 1823 matching lines @@
   is_showing_before_unload_dialog_ = false;
   render_view_host()->JavaScriptDialogClosed(reply_msg,
                                              success,
                                              user_input);
 }
 
 gfx::NativeWindow TabContents::GetDialogRootWindow() {
   return view_->GetTopLevelNativeWindow();
 }
 
-TabContents* TabContents::AsTabContents() {
-  return this;
-}
-
-ExtensionHost* TabContents::AsExtensionHost() {
-  return NULL;
+void TabContents::OnDialogShown() {
+  Activate();
 }
 
 void TabContents::set_encoding(const std::string& encoding) {
   encoding_ = content::GetContentClient()->browser()->
       GetCanonicalEncodingNameByAliasName(encoding);
 }
 
 void TabContents::SwapInRenderViewHost(RenderViewHost* rvh) {
   render_manager_.SwapInRenderViewHost(rvh);
 }
 
 void TabContents::CreateViewAndSetSizeForRVH(RenderViewHost* rvh) {
   RenderWidgetHostView* rwh_view = view()->CreateViewForWidget(rvh);
   rwh_view->SetSize(view()->GetContainerSize());
 }
 
 void TabContents::OnOnlineStateChanged(bool online) {
   render_view_host()->Send(new ViewMsg_NetworkStateChanged(
       render_view_host()->routing_id(), online));
 }