Implement WebPushProvider.unregister() in Chromium.

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/WebPushPermissionStatus.h"
 
 namespace content {
 
 class LayoutTestPushMessagingService : public PushMessagingService {
  public:
   LayoutTestPushMessagingService();
@@ skipping 19 matching lines @@
       const PushMessagingService::RegisterCallback& callback) override;
   // TODO(mvanouwerkerk): Delete once the Push API flows through platform.
   // https://crbug.com/389194
   blink::WebPushPermissionStatus GetPermissionStatus(
       const GURL& requesting_origin,
       int renderer_id,
       int render_frame_id) override;
   blink::WebPushPermissionStatus GetPermissionStatus(
       const GURL& requesting_origin,
       const GURL& embedding_origin) override;
+  void Unregister(const GURL& requesting_origin,
+                  int64 service_worker_registration_id,
+                  const UnregisterCallback& callback) override;
 
  private:
   // Map from origin to permission status.
   std::map<GURL, blink::WebPushPermissionStatus> permission_map_;
+  // Set of currently registered origins.
+  std::set<GURL> registrations_;
 
   DISALLOW_COPY_AND_ASSIGN(LayoutTestPushMessagingService);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_PUSH_MESSAGING_SERVICE_H_