Cancel the request when URLLoader is gone

content/browser/loader/mojo_async_resource_handler.cc

 // Copyright 2016 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/browser/loader/mojo_async_resource_handler.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/time/time.h"
 #include "content/browser/loader/netlog_observer.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/loader/resource_request_info_impl.h"
 #include "content/common/resource_request_completion_status.h"
+#include "content/public/browser/global_request_id.h"
 #include "content/public/browser/resource_dispatcher_host_delegate.h"
 #include "content/public/common/resource_response.h"
 #include "mojo/public/c/system/data_pipe.h"
 #include "mojo/public/cpp/system/data_pipe.h"
 #include "net/base/io_buffer.h"
 #include "net/base/load_flags.h"
 #include "net/base/mime_sniffer.h"
 #include "net/url_request/redirect_info.h"
 
 namespace content {
@@ skipping 202 matching lines @@
 
 void MojoAsyncResourceHandler::OnDataDownloaded(int bytes_downloaded) {
   // Not implemented.
 }
 
 void MojoAsyncResourceHandler::FollowRedirect() {
   NOTIMPLEMENTED();
 }
 
 void MojoAsyncResourceHandler::Cancel() {
-  NOTIMPLEMENTED();
+  const ResourceRequestInfoImpl* info = GetRequestInfo();
+  ResourceDispatcherHostImpl::Get()->CancelRequestFromRenderer(
+      GlobalRequestID(info->GetChildID(), info->GetRequestID()));
 }
 
 void MojoAsyncResourceHandler::ResumeForTesting() {
   Resume();
 }
 
 void MojoAsyncResourceHandler::SetAllocationSizeForTesting(size_t size) {
   g_allocation_size = size;
 }
 
@@ skipping 136 matching lines @@
 
   controller()->CancelWithError(net::ERR_INSUFFICIENT_RESOURCES);
   return false;
 }
 
 void MojoAsyncResourceHandler::OnWritable(MojoResult unused) {
   Resume();
 }
 
 }  // namespace content