Make a clean interface for dialog callbacks.

chrome/browser/extensions/extension_host.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/extensions/extension_host.h"
 
 #include <list>
 
 #include "base/memory/singleton.h"
 #include "base/message_loop.h"
@@ skipping 460 matching lines @@
       render_view_host_, true);
   if (browser) {
     TabContents* active_tab = browser->GetSelectedTabContents();
     if (active_tab)
       return active_tab->view()->GetTopLevelNativeWindow();
   }
 
   return NULL;
 }
 
-TabContents* ExtensionHost::AsTabContents() {
-  return NULL;
-}
-
-ExtensionHost* ExtensionHost::AsExtensionHost() {
-  return this;
-}
-
 void ExtensionHost::OnDialogClosed(IPC::Message* reply_msg,
                                    bool success,
                                    const string16& user_input) {
   render_view_host()->JavaScriptDialogClosed(reply_msg,
                                              success,
                                              user_input);
 }
 
 void ExtensionHost::Close(RenderViewHost* render_view_host) {
   if (extension_host_type_ == ViewType::EXTENSION_POPUP ||
@@ skipping 312 matching lines @@
   }
 }
 
 void ExtensionHost::OnRunFileChooser(
     const ViewHostMsg_RunFileChooser_Params& params) {
   if (file_select_helper_.get() == NULL)
     file_select_helper_.reset(new FileSelectHelper(profile()));
   file_select_helper_->RunFileChooser(render_view_host_,
                                       GetAssociatedTabContents(), params);
 }