Make WebURLLoader capable of retaining received buffers.

content/child/threaded_data_provider.h

Index: content/child/threaded_data_provider.h
diff --git a/content/child/threaded_data_provider.h b/content/child/threaded_data_provider.h
index 5cd7433021adb3aedb8dffa6adaa6d926a089f9d..f47d5553a6c83d382f1e88b7a9db26d0ecec5583 100644
--- a/content/child/threaded_data_provider.h
+++ b/content/child/threaded_data_provider.h
@@ -29,6 +29,7 @@ class WebThreadImplForWorkerScheduler;
 }
 
 namespace content {
+class RefCountedSharedMemory;
 class ResourceDispatcher;
 
 class ThreadedDataProvider {
@@ -36,7 +37,7 @@ class ThreadedDataProvider {
   ThreadedDataProvider(
       int request_id,
       blink::WebThreadedDataReceiver* threaded_data_receiver,
-      linked_ptr<base::SharedMemory> shm_buffer,
+      scoped_refptr<RefCountedSharedMemory> shm_buffer,
       int shm_size,
       scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_);
 
@@ -77,7 +78,7 @@ class ThreadedDataProvider {
 
   scoped_refptr<IPC::MessageFilter> filter_;
   int request_id_;
-  linked_ptr<base::SharedMemory> shm_buffer_;
+  scoped_refptr<RefCountedSharedMemory> shm_buffer_;
   int shm_size_;
   scoped_ptr<base::WeakPtrFactory<ThreadedDataProvider> >
       background_thread_weak_factory_;