Enable use_once_callback for //content/common/*.mojom

content/renderer/image_downloader/image_downloader_impl.cc

 // Copyright 2015 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 "content/renderer/image_downloader/image_downloader_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 95 matching lines @@
   // Owns itself. Will be deleted when message pipe is destroyed or RenderFrame
   // is destructed.
   new ImageDownloaderImpl(render_frame, std::move(request));
 }
 
 // ImageDownloader methods:
 void ImageDownloaderImpl::DownloadImage(const GURL& image_url,
                                         bool is_favicon,
                                         uint32_t max_bitmap_size,
                                         bool bypass_cache,
-                                        const DownloadImageCallback& callback) {
+                                        DownloadImageCallback callback) {
   std::vector<SkBitmap> result_images;
   std::vector<gfx::Size> result_original_image_sizes;
 
   ImageDownloaderBase::DownloadImage(
       image_url, is_favicon, bypass_cache,
       base::Bind(&ImageDownloaderImpl::DidDownloadImage, base::Unretained(this),
-                 max_bitmap_size, callback));
+                 max_bitmap_size, base::Passed(&callback)));
 }
 
 void ImageDownloaderImpl::DidDownloadImage(
     uint32_t max_image_size,
-    const DownloadImageCallback& callback,
+    DownloadImageCallback callback,
     int32_t http_status_code,
     const std::vector<SkBitmap>& images) {
   std::vector<SkBitmap> result_images;
   std::vector<gfx::Size> result_original_image_sizes;
   FilterAndResizeImagesForMaximalSize(images, max_image_size, &result_images,
                                       &result_original_image_sizes);
 
-  callback.Run(http_status_code, result_images, result_original_image_sizes);
+  std::move(callback).Run(http_status_code, result_images,
+                          result_original_image_sizes);
 }
 
 void ImageDownloaderImpl::OnDestruct() {
   delete this;
 }
 
 }  // namespace content