Remove obsolete code that handles menu key release for chromeos

ui/views/widget/desktop_root_window_host_linux.cc

 // Copyright (c) 2012 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 "ui/views/widget/desktop_root_window_host_linux.h"
 
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xutil.h>
 
@@ skipping 791 matching lines @@
   NOTIMPLEMENTED();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopRootWindowHostLinux, views::internal::InputMethodDelegate:
 
 void DesktopRootWindowHostLinux::DispatchKeyEventPostIME(
     const ui::KeyEvent& key) {
   FocusManager* focus_manager =
       native_widget_delegate_->AsWidget()->GetFocusManager();
-  if (focus_manager)
-    focus_manager->MaybeResetMenuKeyState(key);
   if (native_widget_delegate_->OnKeyEvent(key) || !focus_manager)
     return;
   focus_manager->OnKeyEvent(key);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopRootWindowHostLinux, MessageLoop::Dispatcher implementation:
 
 bool DesktopRootWindowHostLinux::Dispatch(const base::NativeEvent& event) {
   XEvent* xev = event;
@@ skipping 225 matching lines @@
 DesktopRootWindowHost* DesktopRootWindowHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura,
     const gfx::Rect& initial_bounds) {
   return new DesktopRootWindowHostLinux(native_widget_delegate,
                                         desktop_native_widget_aura,
                                         initial_bounds);
 }
 
 }  // namespace views