Remove Downcasting RVContextMenuBase in ContextMenuDeleagate implementations.

chrome/browser/apps/app_browsertest.cc

 // Copyright 2013 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 "apps/launcher.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/prefs/pref_service.h"
@@ skipping 57 matching lines @@
 class PlatformAppContextMenu : public RenderViewContextMenu {
  public:
   PlatformAppContextMenu(content::RenderFrameHost* render_frame_host,
                          const content::ContextMenuParams& params)
       : RenderViewContextMenu(render_frame_host, params) {}
 
   bool HasCommandWithId(int command_id) {
     return menu_model_.GetIndexOfCommandId(command_id) != -1;
   }
 
+  void Show() override {}
+
  protected:
   // RenderViewContextMenu implementation.
   bool GetAcceleratorForCommandId(int command_id,
                                   ui::Accelerator* accelerator) override {
     return false;
   }
 };
 
 // This class keeps track of tabs as they are added to the browser. It will be
 // "done" (i.e. won't block on Wait()) once |observations| tabs have been added.
@@ skipping 1234 matching lines @@
         LoadAndLaunchPlatformApp("reinstall_data_cleanup", "Launched");
     ASSERT_TRUE(extension);
     ASSERT_EQ(extension_id, extension->id());
 
     ResultCatcher result_catcher;
     EXPECT_TRUE(result_catcher.GetNextResult());
   }
 }
 
 }  // namespace extensions