Turn off safebrowsing for PREFETCH requests

content/browser/renderer_host/resource_dispatcher_host.cc

Index: content/browser/renderer_host/resource_dispatcher_host.cc
diff --git a/content/browser/renderer_host/resource_dispatcher_host.cc b/content/browser/renderer_host/resource_dispatcher_host.cc
index ce7548176b975c5f49067d7ca024a882a4f1ae13..70c05755cd0ac6b186652444d716fc59b7d47ade 100644
--- a/content/browser/renderer_host/resource_dispatcher_host.cc
+++ b/content/browser/renderer_host/resource_dispatcher_host.cc
@@ -1187,7 +1187,13 @@ void ResourceDispatcherHost::CancelRequest(int child_id,
     DLOG(WARNING) << "Canceling a request that wasn't found";
     return;
   }
-  CancelRequestInternal(i->second, from_renderer);
+  net::URLRequest* request = i->second;
+  const bool started_before_cancel = request->is_pending();
+  CancelRequestInternal(request, from_renderer);
+  // If the request isn't in flight, then we won't get asyncronous notification,
+  // so we have to signal ourselves to finish this request.
+  if (!started_before_cancel)
+    OnResponseCompleted(request);
 }
 
 void ResourceDispatcherHost::CancelRequestInternal(net::URLRequest* request,