Remove the sender_id from the Push API code path.

content/renderer/push_messaging_dispatcher.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_PUSH_MESSAGING_DISPATCHER_H_
 #define CONTENT_RENDERER_PUSH_MESSAGING_DISPATCHER_H_
 
 #include <string>
 
 #include "base/id_map.h"
@@ skipping 20 matching lines @@
                                 public blink::WebPushClient {
  public:
   explicit PushMessagingDispatcher(RenderFrame* render_frame);
   virtual ~PushMessagingDispatcher();
 
  private:
   // RenderFrame::Observer implementation.
   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);
 
-  void DoRegister(const std::string& sender_id,
-                  blink::WebPushRegistrationCallbacks* callbacks,
+  void DoRegister(blink::WebPushRegistrationCallbacks* callbacks,
                   blink::WebServiceWorkerProvider* service_worker_provider,
                   const Manifest& manifest);
 
   void OnRegisterSuccess(int32 callbacks_id,
                          const GURL& endpoint,
                          const std::string& registration_id);
 
   void OnRegisterError(int32 callbacks_id, PushRegistrationStatus status);
 
   IDMap<blink::WebPushRegistrationCallbacks, IDMapOwnPointer>
       registration_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(PushMessagingDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PUSH_MESSAGING_DISPATCHER_H_