Add flag to specify if explicitly requested download is from web.

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 7807a447c5b1e834ef14d59066277aed86d1aa7f..0b029263c2f673634520ad28f2483dc73bb6f373 100644
--- a/content/browser/renderer_host/resource_dispatcher_host_impl.h
+++ b/content/browser/renderer_host/resource_dispatcher_host_impl.h
@@ -75,6 +75,7 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
   virtual void SetAllowCrossOriginAuthPrompt(bool value) OVERRIDE;
   virtual net::Error BeginDownload(
       scoped_ptr<net::URLRequest> request,
+      bool from_web,
       ResourceContext* context,
       int child_id,
       int route_id,
@@ -256,6 +257,7 @@ class CONTENT_EXPORT ResourceDispatcherHostImpl
       int child_id,
       int route_id,
       int request_id,
+      bool from_web,
       const DownloadSaveInfo& save_info,
       const DownloadResourceHandler::OnStartedCallback& started_cb);