Cleanup: Remove unneeded forward declarations from chrome/browser/extensions.

chrome/browser/extensions/extension_host.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_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 10 matching lines @@
 #if defined(TOOLKIT_VIEWS)
 #include "chrome/browser/ui/views/extensions/extension_view.h"
 #elif defined(OS_MACOSX)
 #include "chrome/browser/ui/cocoa/extensions/extension_view_mac.h"
 #elif defined(TOOLKIT_GTK)
 #include "chrome/browser/ui/gtk/extensions/extension_view_gtk.h"
 #endif
 
 class Browser;
 class Extension;
-class FileSelectHelper;
 class RenderProcessHost;
 class RenderWidgetHostView;
 class TabContents;
 struct ViewHostMsg_RunFileChooser_Params;
 struct WebPreferences;
 
 // This class is the browser component of an extension component's RenderView.
 // It handles setting up the renderer process, if needed, with special
 // privileges available to extensions.  It may have a view to be shown in the
 // browser UI, or it may be hidden.
@@ skipping 244 matching lines @@
   // The relevant TabContents associated with this ExtensionHost, if any.
   TabContents* associated_tab_contents_;
 
   // Used to measure how long it's been since the host was created.
   PerfTimer since_created_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_