chrome: Cleanup class/struct forward declarations

chrome/browser/renderer_context_menu/render_view_context_menu_test_util.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_TEST_UTIL_H_
 #define CHROME_BROWSER_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_TEST_UTIL_H_
 
 #include <stddef.h>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 #include "extensions/features/features.h"
 #include "url/gurl.h"
 
 #if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/context_menu_matcher.h"
 #endif
 
-class Browser;
-
 namespace content {
 class WebContents;
 }
 namespace ui {
 class MenuModel;
 }
 
 class TestRenderViewContextMenu : public RenderViewContextMenu {
  public:
   TestRenderViewContextMenu(content::RenderFrameHost* render_frame_host,
@@ skipping 39 matching lines @@
 
   using RenderViewContextMenu::AppendImageItems;
 
   void Show() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestRenderViewContextMenu);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_TEST_UTIL_H_