Fixes for -Wunused-function on Linux, Android and ChromeOS

ui/views/widget/native_widget_aura.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/native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/strings/string_util.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/activation_client.h"
@@ skipping 955 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // Widget, public:
 
 // static
 void Widget::NotifyLocaleChanged() {
   // Deliberately not implemented.
 }
 
 namespace {
+#if defined(OS_WIN) || (defined(USE_X11) && !defined(OS_CHROMEOS))
 void CloseWindow(aura::Window* window) {
   if (window) {
     Widget* widget = Widget::GetWidgetForNativeView(window);
     if (widget && widget->is_secondary_widget())
       // To avoid the delay in shutdown caused by using Close which may wait
       // for animations, use CloseNow. Because this is only used on secondary
       // widgets it seems relatively safe to skip the extra processing of
       // Close.
       widget->CloseNow();
   }
 }
+#endif
+
 #if defined(OS_WIN)
 BOOL CALLBACK WindowCallbackProc(HWND hwnd, LPARAM lParam) {
   aura::Window* root_window =
       DesktopRootWindowHostWin::GetContentWindowForHWND(hwnd);
   CloseWindow(root_window);
   return TRUE;
 }
 #endif
 }  // namespace
 
@@ skipping 139 matching lines @@
   return aura::Env::GetInstance()->IsMouseButtonDown();
 }
 
 // static
 bool NativeWidgetPrivate::IsTouchDown() {
   return aura::Env::GetInstance()->is_touch_down();
 }
 
 }  // namespace internal
 }  // namespace views