Introduce WebWorkerPermissionClientProxy to deprecate WorkerAllowMainThreadBridge

public/web/WebFrameClient.h

Index: public/web/WebFrameClient.h
diff --git a/public/web/WebFrameClient.h b/public/web/WebFrameClient.h
index b9e6a3c4b07fcd949632c56cea75cc48d6165c61..f535472cb32698ea9f051c19bdbf8affc30eba6a 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -71,7 +71,7 @@ class WebString;
 class WebURL;
 class WebURLLoader;
 class WebURLResponse;
-class WebWorker;
+class WebWorkerPermissionClientProxy;
 struct WebPluginParams;
 struct WebRect;
 struct WebSize;
@@ -93,6 +93,9 @@ public:
     // May return null. Takes ownership of the client.
     virtual WebServiceWorkerProvider* createServiceWorkerProvider(WebFrame*, WebServiceWorkerProviderClient*) { return 0; }
 
+    // May return null.
+    virtual WebWorkerPermissionClientProxy* createWorkerPermissionClientProxy(WebFrame*) { return 0; }
+
 
     // Services ------------------------------------------------------------