Makes GetComponentExtensionResourceManager() thread-safe.

extensions/browser/image_loader.cc

 // Copyright 2014 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 "extensions/browser/image_loader.h"
 
 #include <map>
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 94 matching lines @@
   int i = 0;
   for (std::vector<ImageLoader::ImageRepresentation>::const_iterator
            it = info_list.begin();
        it != info_list.end();
        ++it, ++i) {
     DCHECK(it->resource.relative_path().empty() ||
            extension->path() == it->resource.extension_root());
 
     int resource_id;
     if (extension->location() == Manifest::COMPONENT) {
-      extensions::ComponentExtensionResourceManager* manager =
-          extensions::ExtensionsBrowserClient::Get()->
-          GetComponentExtensionResourceManager();
+      const extensions::ComponentExtensionResourceManager* manager =
+          extensions::ExtensionsBrowserClient::Get()
+              ->GetComponentExtensionResourceManager();
       if (manager && manager->IsComponentExtensionResource(
               extension->path(), it->resource.relative_path(), &resource_id)) {
         LoadResourceOnUIThread(resource_id, &bitmaps[i]);
       }
     }
   }
   return bitmaps;
 }
 
 }  // namespace
@@ skipping 194 matching lines @@
        it != image_skia_map.end();
        ++it) {
     it->second.MakeThreadSafe();
     image_family.Add(it->second);
   }
 
   callback.Run(image_family);
 }
 
 }  // namespace extensions