Fixed all unused-variable Clang warnings on Windows.

ui/aura/window_tree_host_win.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/aura/window_tree_host_win.h"
 
 #include <windows.h>
 
 #include <algorithm>
 
 #include "base/message_loop/message_loop.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/cursor/cursor_loader_win.h"
 #include "ui/base/view_prop.h"
 #include "ui/compositor/compositor.h"
 #include "ui/events/event.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/screen.h"
 #include "ui/platform_window/win/win_window.h"
 
 using std::max;
 using std::min;
 
 namespace aura {
-namespace {
-
-bool use_popup_as_root_window_for_test = false;
-
-}  // namespace
 
 // static
 WindowTreeHost* WindowTreeHost::Create(const gfx::Rect& bounds) {
   return new WindowTreeHostWin(bounds);
 }
 
 // static
 gfx::Size WindowTreeHost::GetNativeScreenSize() {
   return gfx::Size(GetSystemMetrics(SM_CXSCREEN),
                    GetSystemMetrics(SM_CYSCREEN));
@@ skipping 113 matching lines @@
   widget_ = widget;
   CreateCompositor(widget);
 }
 
 void WindowTreeHostWin::OnActivationChanged(bool active) {
   if (active)
     OnHostActivated();
 }
 
 }  // namespace aura