Move ChromeExtensionHostMsg_AttachGuest to extensions.

chrome/renderer/extensions/guest_view_internal_custom_bindings.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 CHROME_RENDERER_EXTENSIONS_GUEST_VIEW_INTERNAL_CUSTOM_BINDINGS_H_
-#define CHROME_RENDERER_EXTENSIONS_GUEST_VIEW_INTERNAL_CUSTOM_BINDINGS_H_
-
-#include "extensions/renderer/object_backed_native_handler.h"
-
-namespace extensions {
-class Dispatcher;
-
-// Implements custom bindings for the guestViewInternal API.
-class GuestViewInternalCustomBindings : public ObjectBackedNativeHandler {
- public:
-  explicit GuestViewInternalCustomBindings(ScriptContext* context);
-
- private:
-  // AttachGuest attaches a GuestView to a provided container element. Once
-  // attached, the GuestView will participate in layout of the container page
-  // and become visible on screen.
-  // AttachGuest takes three parameters:
-  // |element_instance_id| uniquely identifies a container within the content
-  // module is able to host GuestViews.
-  // |guest_instance_id| uniquely identifies an unattached GuestView.
-  // |attach_params| is typically used to convey the current state of the
-  // container element at the time of attachment. These parameters are passed
-  // down to the GuestView. The GuestView may use these parameters to update the
-  // state of the guest hosted in another process.
-  void AttachGuest(const v8::FunctionCallbackInfo<v8::Value>& args);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_RENDERER_EXTENSIONS_GUEST_VIEW_INTERNAL_CUSTOM_BINDINGS_H_