chrome: Cleanup class/struct forward declarations

chrome/browser/renderer_context_menu/render_view_context_menu.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_BROWSER_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_H_
 #define CHROME_BROWSER_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 14 matching lines @@
 #include "printing/features/features.h"
 #include "ui/base/models/simple_menu_model.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/gfx/geometry/vector2d.h"
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/context_menu_matcher.h"
 #include "chrome/browser/extensions/menu_manager.h"
 #endif
 
-class OpenWithMenuObserver;
 class PrintPreviewContextMenuObserver;
 class Profile;
 class SpellingMenuObserver;
 class SpellingOptionsSubMenuObserver;
 
 namespace content {
 class RenderFrameHost;
 class WebContents;
 }
 
@@ skipping 200 matching lines @@
 
   // In the case of a MimeHandlerView this will point to the WebContents that
   // embeds the MimeHandlerViewGuest. Otherwise this will be the same as
   // |source_web_contents_|.
   content::WebContents* const embedder_web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewContextMenu);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_H_