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
new file mode 100644
index 0000000000000000000000000000000000000000..2b78df2bc3435cd938b1049b048bdc2d0d97cd3e
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+++ b/chrome/browser/extensions/global_shortcut_listener_athena.h
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+// 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_