Clean up deprecated Web Push API code-paths.

content/renderer/push_messaging_dispatcher.h

Index: content/renderer/push_messaging_dispatcher.h
diff --git a/content/renderer/push_messaging_dispatcher.h b/content/renderer/push_messaging_dispatcher.h
index de9f8c97a71ab20b93f620597ea5688e0bb0588d..1d6c87dc7930378e7e69399f57b39da7254f43ab 100644
--- a/content/renderer/push_messaging_dispatcher.h
+++ b/content/renderer/push_messaging_dispatcher.h
@@ -20,7 +20,6 @@ class Message;
 
 namespace blink {
 class WebServiceWorkerProvider;
-class WebString;
 }  // namespace blink
 
 namespace content {
@@ -38,11 +37,6 @@ class PushMessagingDispatcher : public RenderFrameObserver,
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // WebPushClient implementation.
-  // TODO(peter): Remove this signature of registerPushMessaging.
-  virtual void registerPushMessaging(
-      const blink::WebString& sender_id,
-      blink::WebPushRegistrationCallbacks* callbacks,
-      blink::WebServiceWorkerProvider* service_worker_provider);
   virtual void registerPushMessaging(
       blink::WebPushRegistrationCallbacks* callbacks,
       blink::WebServiceWorkerProvider* service_worker_provider);