Revert of Use a stub implementation of GlobalShortcutListener for Athena

chrome/browser/extensions/global_shortcut_listener_athena.h

Index: chrome/browser/extensions/global_shortcut_listener_athena.h
diff --git a/chrome/browser/extensions/global_shortcut_listener_athena.h b/chrome/browser/extensions/global_shortcut_listener_athena.h
deleted file mode 100644
index 2b78df2bc3435cd938b1049b048bdc2d0d97cd3e..0000000000000000000000000000000000000000
--- a/chrome/browser/extensions/global_shortcut_listener_athena.h
+++ /dev/null
@@ -1,30 +0,0 @@
-// 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_EXTENSIONS_GLOBAL_SHORTCUT_LISTENER_ATHENA_H_
-#define CHROME_BROWSER_EXTENSIONS_GLOBAL_SHORTCUT_LISTENER_ATHENA_H_
-
-#include "chrome/browser/extensions/global_shortcut_listener.h"
-
-namespace extensions {
-
-// Athena implementation of GlobalShortcutListener.
-class GlobalShortcutListenerAthena : public GlobalShortcutListener {
- public:
-  GlobalShortcutListenerAthena();
-  ~GlobalShortcutListenerAthena() override;
-
- private:
-  // GlobalShortcutListener:
-  void StartListening() override;
-  void StopListening() override;
-  bool RegisterAcceleratorImpl(const ui::Accelerator& accelerator) override;
-  void UnregisterAcceleratorImpl(const ui::Accelerator& accelerator) override;
-
-  DISALLOW_COPY_AND_ASSIGN(GlobalShortcutListenerAthena);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_GLOBAL_SHORTCUT_LISTENER_ATHENA_H_