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

ui/gfx/point.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/point.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 
 namespace gfx {
 
 template class PointBase<Point, int, Vector2d>;
 
 #if defined(OS_WIN)
 Point::Point(DWORD point) : PointBase<Point, int, Vector2d>(0, 0){
   POINTS points = MAKEPOINTS(point);
   set_x(points.x);
   set_y(points.y);
@@ skipping 23 matching lines @@
 CGPoint Point::ToCGPoint() const {
   return CGPointMake(x(), y());
 }
 #endif
 
 std::string Point::ToString() const {
   return base::StringPrintf("%d,%d", x(), y());
 }
 
 }  // namespace gfx