Rename WebCore to blink in Modules

Source/modules/push_messaging/ServiceWorkerGlobalScopePush.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 ServiceWorkerGlobalScopePush_h
 #define ServiceWorkerGlobalScopePush_h
 
 #include "core/events/EventTarget.h"
 
-namespace WebCore {
+namespace blink {
 
 class ServiceWorkerGlobalScopePush {
 public:
     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(push);
 };
 
-} // namespace WebCore
+} // namespace blink
 
 #endif // ServiceWorkerGlobalScopePush_h