Implement RevokePermission() method in PermissionService.

content/browser/permissions/permission_service_impl.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_BROWSER_PERMISSIONS_PERMISSION_SERVICE_IMPL_H_
 #define CONTENT_BROWSER_PERMISSIONS_PERMISSION_SERVICE_IMPL_H_
 
 #include "base/id_map.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 33 matching lines @@
 
   // PermissionService.
   void HasPermission(
       PermissionName permission,
       const mojo::String& origin,
       const mojo::Callback<void(PermissionStatus)>& callback) override;
   void RequestPermission(
       PermissionName permission,
       const mojo::String& origin,
       const mojo::Callback<void(PermissionStatus)>& callback) override;
+  void RevokePermission(
+      PermissionName permission,
+      const mojo::String& origin,
+      const mojo::Callback<void(PermissionStatus)>& callback) override;
 
   // mojo::InterfaceImpl.
   void OnConnectionError() override;
 
   void OnRequestPermissionResponse(
     const mojo::Callback<void(PermissionStatus)>& callback,
     int request_id,
     bool allowed);
 
   RequestsMap pending_requests_;
   // context_ owns |this|.
   PermissionServiceContext* context_;
   base::WeakPtrFactory<PermissionServiceImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionServiceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_PERMISSIONS_PERMISSION_SERVICE_IMPL_H_