Rename "register" -> "subscribe" in the Push Messaging code.

content/shell/browser/layout_test/layout_test_push_messaging_service.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_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_PUSH_MESSAGING_SERVICE_H_
 #define CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_PUSH_MESSAGING_SERVICE_H_
 
 #include <map>
 #include <set>
 
 #include "content/public/browser/push_messaging_service.h"
 #include "content/public/common/push_messaging_status.h"
 #include "third_party/WebKit/public/platform/modules/push_messaging/WebPushPermissionStatus.h"
 
 namespace content {
 
 class LayoutTestPushMessagingService : public PushMessagingService {
  public:
   LayoutTestPushMessagingService();
   ~LayoutTestPushMessagingService() override;
 
   // PushMessagingService implementation:
   GURL GetPushEndpoint() override;
-  void RegisterFromDocument(
+  void SubscribeFromDocument(
       const GURL& requesting_origin,
       int64 service_worker_registration_id,
       const std::string& sender_id,
       int renderer_id,
       int render_frame_id,
       bool user_visible,
-      const PushMessagingService::RegisterCallback& callback) override;
-  void RegisterFromWorker(
+      const PushMessagingService::SubscribeCallback& callback) override;
+  void SubscribeFromWorker(
       const GURL& requesting_origin,
       int64 service_worker_registration_id,
       const std::string& sender_id,
       bool user_visible,
-      const PushMessagingService::RegisterCallback& callback) override;
+      const PushMessagingService::SubscribeCallback& callback) override;
   blink::WebPushPermissionStatus GetPermissionStatus(
       const GURL& requesting_origin,
       const GURL& embedding_origin,
       bool user_visible) override;
-  void Unregister(const GURL& requesting_origin,
-                  int64 service_worker_registration_id,
-                  const std::string& sender_id,
-                  const UnregisterCallback& callback) override;
+  void Unsubscribe(const GURL& requesting_origin,
+                   int64 service_worker_registration_id,
+                   const std::string& sender_id,
+                   const UnsubscribeCallback& callback) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayoutTestPushMessagingService);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_PUSH_MESSAGING_SERVICE_H_