Move Push-related Blink API headers into their own directory.

public/platform/WebPushPermissionStatus.h

Index: public/platform/WebPushPermissionStatus.h
diff --git a/public/platform/WebPushPermissionStatus.h b/public/platform/WebPushPermissionStatus.h
index bdb5725a8b18651cc62c51575fed20cf565cee3e..f9a5591f314ef10663105db31f85948404733b59 100644
--- a/public/platform/WebPushPermissionStatus.h
+++ b/public/platform/WebPushPermissionStatus.h
@@ -1,20 +1 @@
-// 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 WebPushPermissionStatus_h
-#define WebPushPermissionStatus_h
-
-namespace blink {
-
-enum WebPushPermissionStatus {
-    WebPushPermissionStatusGranted = 0,
-    WebPushPermissionStatusDenied,
-    WebPushPermissionStatusDefault,
-
-    // Used for IPC message range checks.
-    WebPushPermissionStatusLast = WebPushPermissionStatusDefault
-};
-
-} // namespace blink
-#endif // WebPushPermissionStatus_h
+#include "public/platform/modules/push_messaging/WebPushPermissionStatus.h"