Switch to standard integer types in ui/gfx/.

ui/gfx/screen_win_unittest.cc

 // Copyright 2015 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/gfx/screen_win.h"
 
 #include <cwchar>
 #include <string>
 #include <vector>
 
 #include <windows.h>
+#include <stddef.h>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/win/dpi.h"
 
 namespace gfx {
 
 namespace {
 
@@ skipping 48 matching lines @@
                                             L"primary"));
   std::vector<gfx::Display> displays =
       ScreenWin::GetDisplaysForMonitorInfos(monitor_infos);
 
   ASSERT_EQ(1u, displays.size());
   EXPECT_EQ(gfx::Rect(0, 0, 960, 600), displays[0].bounds());
   EXPECT_EQ(gfx::Rect(0, 0, 960, 550), displays[0].work_area());
 }
 
 }  // namespace gfx