Try to cut down Browser/TabContents header dependencies.

chrome/browser/extensions/image_loading_tracker_unittest.cc

 // 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.
 
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/extensions/image_loading_tracker.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "chrome/common/json_value_serializer.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/notification_type.h"
 #include "gfx/size.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 
 class ImageLoadingTrackerTest : public testing::Test,
                                 public ImageLoadingTracker::Observer {
  public:
   ImageLoadingTrackerTest()
       : image_loaded_count_(0),
         quit_in_image_loaded_(false),
         ui_thread_(ChromeThread::UI, &ui_loop_),
         file_thread_(ChromeThread::FILE),
         io_thread_(ChromeThread::IO) {
@@ skipping 143 matching lines @@
 
   WaitForImageLoad();
 
   // Even though we deleted the extension, we should still get the image.
   // We should still have gotten the image.
   EXPECT_EQ(1, image_loaded_count());
 
   // Check that the image was loaded.
   EXPECT_EQ(Extension::EXTENSION_ICON_SMALLISH, image_.width());
 }