Try to cut down Browser/TabContents header dependencies.

chrome/common/extensions/extension.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 "chrome/common/extensions/extension.h"
 
 #include <algorithm>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 15 matching lines @@
 #include "chrome/common/extensions/extension_action.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_error_utils.h"
 #include "chrome/common/extensions/extension_l10n_util.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "chrome/common/extensions/user_script.h"
 #include "chrome/common/notification_service.h"
 #include "chrome/common/url_constants.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
+#include "third_party/skia/include/core/SkBitmap.h"
 #include "webkit/glue/image_decoder.h"
 
 #if defined(OS_WIN)
 #include "base/registry.h"
 #endif
 
 namespace keys = extension_manifest_keys;
 namespace values = extension_manifest_values;
 namespace errors = extension_manifest_errors;
 
@@ skipping 1675 matching lines @@
         } else {
           return false;
         }
       } else {
         return true;
       }
     }
   }
   return false;
 }