Rename navigator.serviceWorker.current to controller.

public/platform/WebServiceWorkerProviderClient.h

Index: public/platform/WebServiceWorkerProviderClient.h
diff --git a/public/platform/WebServiceWorkerProviderClient.h b/public/platform/WebServiceWorkerProviderClient.h
index 8c3eba3f59336040c081b84f8b64b300880aa6dc..5fe61e24ca7feac32bd439b09890d568c69a3ad8 100644
--- a/public/platform/WebServiceWorkerProviderClient.h
+++ b/public/platform/WebServiceWorkerProviderClient.h
@@ -44,6 +44,9 @@ public:
     virtual ~WebServiceWorkerProviderClient() { }
 
     // The callee will take ownership of the given WebServiceWorker object.
+    virtual void setController(WebServiceWorker*) = 0;
+
+    // FIXME: Remove when the embedder switches to setController.
     virtual void setCurrentServiceWorker(WebServiceWorker*) = 0;
 
     virtual void dispatchMessageEvent(const WebString& message, const WebMessagePortChannelArray&) = 0;