Use a direct include of strings headers in ui/, part 3.

ui/gfx/display.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/gfx/display.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
-#include "base/string_number_conversions.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/stringprintf.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/gfx/insets.h"
 #include "ui/gfx/point_conversions.h"
 #include "ui/gfx/point_f.h"
 #include "ui/gfx/size_conversions.h"
 
 namespace gfx {
 namespace {
 
 bool HasForceDeviceScaleFactorImpl() {
@@ skipping 120 matching lines @@
 
 int64 Display::InternalDisplayId() {
   return internal_display_id_;
 }
 
 void Display::SetInternalDisplayId(int64 internal_display_id) {
   internal_display_id_ = internal_display_id;
 }
 
 }  // namespace gfx