Cleanup: Remove forward declarations in various chrome/browser directories.

chrome/browser/ui/search_engines/search_engine_tab_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_SEARCH_ENGINES_SEARCH_ENGINE_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_SEARCH_ENGINES_SEARCH_ENGINE_TAB_HELPER_H_
 #pragma once
 
 #include "chrome/browser/ui/find_bar/find_bar_controller.h"
 #include "chrome/browser/ui/find_bar/find_notification_details.h"
 #include "chrome/common/search_provider.h"
 #include "content/browser/tab_contents/tab_contents_observer.h"
 
 class SearchEngineTabHelperDelegate;
-class TabContentsWrapper;
 
 // Per-tab search engine manager. Handles dealing search engine processing
 // functionality.
 class SearchEngineTabHelper : public TabContentsObserver {
  public:
   explicit SearchEngineTabHelper(TabContents* tab_contents);
   virtual ~SearchEngineTabHelper();
 
   SearchEngineTabHelperDelegate* delegate() const { return delegate_; }
   void set_delegate(SearchEngineTabHelperDelegate* d) { delegate_ = d; }
@@ skipping 14 matching lines @@
   void GenerateKeywordIfNecessary(
       const ViewHostMsg_FrameNavigate_Params& params);
 
   // Delegate for notifying our owner about stuff. Not owned by us.
   SearchEngineTabHelperDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchEngineTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_SEARCH_ENGINES_SEARCH_ENGINE_TAB_HELPER_H_