Ensure all AssociatedURLLoader be cancelled before shutting down Blink.

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"
 #include "base/message_loop/message_loop.h"
 #include "content/child/image_decoder.h"
 #include "content/public/renderer/render_frame.h"
+#include "content/public/renderer/render_thread.h"
 #include "content/renderer/fetchers/multi_resolution_image_resource_fetcher.h"
 #include "mojo/common/url_type_converters.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "net/base/data_url.h"
 #include "skia/ext/image_operations.h"
 #include "skia/public/type_converters.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 #include "third_party/WebKit/public/web/WebLocalFrame.h"
 #include "third_party/WebKit/public/web/WebView.h"
@@ skipping 90 matching lines @@
 
 }  // namespace
 
 namespace content {
 
 ImageDownloaderImpl::ImageDownloaderImpl(
     RenderFrame* render_frame,
     mojo::InterfaceRequest<content::mojom::ImageDownloader> request)
     : RenderFrameObserver(render_frame), binding_(this, std::move(request)) {
   DCHECK(render_frame);
+  RenderThread::Get()->AddObserver(this);
 }
 
 ImageDownloaderImpl::~ImageDownloaderImpl() {
+  RenderThread::Get()->RemoveObserver(this);
 }
 
 // static
 void ImageDownloaderImpl::CreateMojoService(
     RenderFrame* render_frame,
     mojo::InterfaceRequest<content::mojom::ImageDownloader> request) {
   DVLOG(1) << "ImageDownloaderImpl::CreateService";
   DCHECK(render_frame);
 
   new ImageDownloaderImpl(render_frame, std::move(request));
 }
 
+// Ensure all loaders cleared before calling blink::shutdown.
+void ImageDownloaderImpl::OnRenderProcessShutdown() {
+  image_fetchers_.clear();
+}
+
 // ImageDownloader methods:
 void ImageDownloaderImpl::DownloadImage(const mojo::String& url,
                                         bool is_favicon,
                                         uint32_t max_bitmap_size,
                                         bool bypass_cache,
                                         const DownloadImageCallback& callback) {
   const GURL image_url = url.To<GURL>();
 
   std::vector<SkBitmap> result_images;
   std::vector<gfx::Size> result_original_image_sizes;
@@ skipping 62 matching lines @@
     int32_t http_status_code,
     const std::vector<SkBitmap>& result_images,
     const std::vector<gfx::Size>& result_original_image_sizes,
     const DownloadImageCallback& callback) {
   callback.Run(http_status_code,
                mojo::Array<skia::mojom::BitmapPtr>::From(result_images),
                mojo::Array<mojo::SizePtr>::From(result_original_image_sizes));
 }
 
 }  // namespace content