Allow customization of HttpPostProviderFactory via ProfileSyncService

sync/internal_api/public/http_bridge.h

Index: sync/internal_api/public/http_bridge.h
diff --git a/sync/internal_api/public/http_bridge.h b/sync/internal_api/public/http_bridge.h
index be49aa7bcb27a4d35909c641225057f242a87708..ef2108163c7de8d381b0f3f9e4dbb521d3e1c537 100644
--- a/sync/internal_api/public/http_bridge.h
+++ b/sync/internal_api/public/http_bridge.h
@@ -237,12 +237,13 @@ class SYNC_EXPORT HttpBridgeFactory : public HttpPostProviderFactory,
  public:
   HttpBridgeFactory(
       net::URLRequestContextGetter* baseline_context_getter,
-      const NetworkTimeUpdateCallback& network_time_update_callback,
-      CancelationSignal* cancelation_signal);
+      const NetworkTimeUpdateCallback& network_time_update_callback);
   virtual ~HttpBridgeFactory();
 
   // HttpPostProviderFactory:
   virtual void Init(const std::string& user_agent) OVERRIDE;
+  virtual void RegisterCancelationSignal(
+      CancelationSignal* cancelation_signal) OVERRIDE;
   virtual HttpPostProviderInterface* Create() OVERRIDE;
   virtual void Destroy(HttpPostProviderInterface* http) OVERRIDE;
 
@@ -268,7 +269,7 @@ class SYNC_EXPORT HttpBridgeFactory : public HttpPostProviderFactory,
 
   NetworkTimeUpdateCallback network_time_update_callback_;
 
-  CancelationSignal* const cancelation_signal_;
+  CancelationSignal* cancelation_signal_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpBridgeFactory);
 };