Revert 157773 - This is followup from Charlie's comments on Fady's cl: http://chromiumcodereview.ap…

content/browser/browser_plugin/browser_plugin_guest_helper.h

-// Copyright (c) 2012 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 CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_HELPER_H_
-#define CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_HELPER_H_
-
-#include "content/public/browser/render_view_host_observer.h"
-#include "content/public/browser/notification_registrar.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
-
-class WebCursor;
-struct ViewHostMsg_UpdateRect_Params;
-
-namespace gfx {
-class Size;
-}
-
-namespace content {
-class BrowserPluginGuest;
-class RenderViewHost;
-
-// Helper for browser plugin guest.
-//
-// It overrides different WebContents messages that require special treatment
-// for a WebContents to act as a guest. All functionality is handled by its
-// delegate. This class exists so we have separation of messages requiring
-// special handling, which can be moved to a message filter (IPC thread) for
-// future optimization.
-//
-// The lifetime of this class is managed by the associated RenderViewHost. A
-// BrowserPluginGuestHelper is created whenever a BrowserPluginGuest is created.
-class BrowserPluginGuestHelper : public RenderViewHostObserver {
- public:
-  BrowserPluginGuestHelper(BrowserPluginGuest* guest,
-                           RenderViewHost* render_view_host);
-  virtual ~BrowserPluginGuestHelper();
-
- protected:
-  // RenderViewHostObserver implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-
- private:
-  // Message handlers
-  void OnUpdateRect(const ViewHostMsg_UpdateRect_Params& params);
-  void OnHandleInputEventAck(WebKit::WebInputEvent::Type event_type,
-                             bool processed);
-  void OnTakeFocus(bool reverse);
-  void OnShowWidget(int route_id, const gfx::Rect& initial_pos);
-  void OnSetCursor(const WebCursor& cursor);
-
-  BrowserPluginGuest* guest_;
-  // A scoped container for notification registries.
-  NotificationRegistrar registrar_;
-
-  DISALLOW_COPY_AND_ASSIGN(BrowserPluginGuestHelper);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_HELPER_H_