Remove PushPermissionClient.

Source/modules/push_messaging/PushPermissionClient.cpp

-// 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.
-
-#include "config.h"
-#include "modules/push_messaging/PushPermissionClient.h"
-
-#include "core/dom/Document.h"
-#include "core/dom/ExecutionContext.h"
-#include "core/frame/LocalFrame.h"
-
-namespace blink {
-
-const char* PushPermissionClient::supplementName()
-{
-    return "PushPermissionClient";
-}
-
-PushPermissionClient* PushPermissionClient::from(ExecutionContext* context)
-{
-    if (!context->isDocument())
-        return nullptr;
-
-    const Document* document = toDocument(context);
-    ASSERT(document->frame());
-
-    if (!document->frame()->isLocalFrame())
-        return nullptr;
-
-    return static_cast<PushPermissionClient*>(WillBeHeapSupplement<LocalFrame>::from(document->frame(), supplementName()));
-}
-
-void providePushPermissionClientTo(LocalFrame& frame, PassOwnPtrWillBeRawPtr<PushPermissionClient> client)
-{
-    frame.provideSupplement(PushPermissionClient::supplementName(), client);
-}
-
-}