Move guest view container message routing out of content/.

extensions/renderer/guest_view/extensions_guest_view_container_dispatcher.cc

+// Copyright 2015 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 "extensions/renderer/guest_view/extensions_guest_view_container_dispatcher.h"
+
+#include "ipc/ipc_message.h"
+#include "ipc/ipc_message_macros.h"
+
+namespace extensions {
+
+ExtensionsGuestViewContainerDispatcher::
+    ExtensionsGuestViewContainerDispatcher() {
+}
+
+ExtensionsGuestViewContainerDispatcher::
+    ~ExtensionsGuestViewContainerDispatcher() {
+}
+
+bool ExtensionsGuestViewContainerDispatcher::HandlesMessage(
+    const IPC::Message& message) {
+  return GuestViewContainerDispatcher::HandlesMessage(message) ||
+         (IPC_MESSAGE_CLASS(message) == ExtensionsGuestViewMsgStart);
+}
+
+}  // namespace extensions