Fix crashes due to gfx::Image unsafe thread passing

chrome/browser/enhanced_bookmarks/android/bookmark_image_service_android.h

 // 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.
 
 #ifndef CHROME_BROWSER_ENHANCED_BOOKMARKS_ANDROID_BOOKMARK_IMAGE_SERVICE_ANDROID_H_
 #define CHROME_BROWSER_ENHANCED_BOOKMARKS_ANDROID_BOOKMARK_IMAGE_SERVICE_ANDROID_H_
 
 #include "components/enhanced_bookmarks/bookmark_image_service.h"
 #include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
 
@@ skipping 32 matching lines @@
   // image. If it is, invokes RetrieveSalientImageFromContext() for the relevant
   // urls.
   void FinishSuccessfulPageLoadForTab(content::WebContents* web_contents,
                                       bool update_bookmark);
 
  private:
   void RetrieveSalientImageFromContextCallback(const GURL& page_url,
                                                bool update_bookmark,
                                                const base::Value* result);
 
-  gfx::Image ResizeImage(gfx::Image image) override;
+  scoped_ptr<gfx::Image> ResizeImage(const gfx::Image& image) override;
 
   content::BrowserContext* browser_context_;
   // The script injected in a page to extract image urls.
   base::string16 script_;
   // Maximum size for retrieved salient images in pixels. This is used when
   // resizing an image.
   gfx::Size max_size_;
 
   class BitmapFetcherHandler : private chrome::BitmapFetcherDelegate {
    public:
@@ skipping 19 matching lines @@
 
     DISALLOW_COPY_AND_ASSIGN(BitmapFetcherHandler);
   };
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkImageServiceAndroid);
 };
 
 }  // namespace enhanced_bookmarks
 
 #endif  // CHROME_BROWSER_ENHANCED_BOOKMARKS_ANDROID_BOOKMARK_IMAGE_SERVICE_ANDROID_H_