Send Allow{Database,FileSystem,IndexedDB} sync IPCs directly from worker thread

content/public/renderer/content_renderer_client.cc

Index: content/public/renderer/content_renderer_client.cc
diff --git a/content/public/renderer/content_renderer_client.cc b/content/public/renderer/content_renderer_client.cc
index 6c93cbfca05d36de3784c399b2a9c975eabfbcc7..fbbe34340bc7560867a25296883daab5f1425007 100644
--- a/content/public/renderer/content_renderer_client.cc
+++ b/content/public/renderer/content_renderer_client.cc
@@ -195,4 +195,10 @@ bool ContentRendererClient::ShouldEnableSiteIsolationPolicy() const {
   return true;
 }
 
+WebKit::WebWorkerPermissionClientProxy*
+ContentRendererClient::CreateWorkerPermissionClientProxy(
+    RenderView* render_view, WebKit::WebFrame* frame) {
+  return NULL;
+}
+
 }  // namespace content