Revert 67662 - FBTF: Remove unneeded headers from base/ (part 10)...

chrome/browser/tab_contents/thumbnail_generator.h

 // Copyright (c) 2010 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_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
 #define CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
 #pragma once
 
 #include <map>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/linked_ptr.h"
+#include "base/lock.h"
 #include "base/timer.h"
 #include "chrome/browser/renderer_host/render_widget_host_painting_observer.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 
 class RenderWidgetHost;
 class SkBitmap;
 class TabContents;
 
 // This class MUST be destroyed after the RenderWidgetHosts, since it installs
@@ skipping 94 matching lines @@
   // Map of callback objects by sequence number.
   struct AsyncRequestInfo;
   typedef std::map<int,
                    linked_ptr<AsyncRequestInfo> > ThumbnailCallbackMap;
   ThumbnailCallbackMap callback_map_;
 
   DISALLOW_COPY_AND_ASSIGN(ThumbnailGenerator);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_