Stop using ScopedAllowIO in content::ResourceDispatcherHostImpl

content/browser/renderer_host/resource_dispatcher_host_impl.h

Index: content/browser/renderer_host/resource_dispatcher_host_impl.h
diff --git a/content/browser/renderer_host/resource_dispatcher_host_impl.h b/content/browser/renderer_host/resource_dispatcher_host_impl.h
index 83fe21de76db16fb13bff7e5497a5060b719419f..cd7533fb62805be7b27b3e744c8f49cd02b1a3f2 100644
--- a/content/browser/renderer_host/resource_dispatcher_host_impl.h
+++ b/content/browser/renderer_host/resource_dispatcher_host_impl.h
@@ -62,8 +62,7 @@ struct Referrer;
 
 class CONTENT_EXPORT ResourceDispatcherHostImpl
     : public ResourceDispatcherHost,
-      public ResourceLoaderDelegate,
-      public base::SupportsWeakPtr<ResourceDispatcherHostImpl> {
+      public ResourceLoaderDelegate {
  public:
   ResourceDispatcherHostImpl();
   virtual ~ResourceDispatcherHostImpl();
@@ -300,10 +299,19 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
   void OnSyncLoad(int request_id,
                   const ResourceHostMsg_Request& request_data,
                   IPC::Message* sync_result);
-  void BeginRequest(int request_id,
+  // If request_data comes with upload data, gets the content length and passes
+  // it to BeginRequest(). Otherwise, calls BeginRequest() directly.
+  void PrepareToBeginRequest(
+      int request_id,
+      const ResourceHostMsg_Request& request_data,
+      IPC::Message* sync_result,
+      int route_id);
+  void BeginRequest(scoped_refptr<ResourceMessageFilter> filter,
+                    int request_id,
                     const ResourceHostMsg_Request& request_data,
                     IPC::Message* sync_result,  // only valid for sync
-                    int route_id);  // only valid for async
+                    int route_id, // only valid for async
+                    uint64 upload_size);
   void OnDataReceivedACK(int request_id);
   void OnDataDownloadedACK(int request_id);
   void OnUploadProgressACK(int request_id);
@@ -412,6 +420,9 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
   // shutdown.
   std::set<const ResourceContext*> active_resource_contexts_;
 
+  // WeakPtrFactory to be used on IO thread.
+  base::WeakPtrFactory<ResourceDispatcherHostImpl> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };