Use a direct include of strings headers in ui/, part 2.

ui/gfx/rect_base_impl.h

 // 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/rect_base.h"
 
 #include "base/logging.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 
 // This file provides the implementation for RectBaese template and
 // used to instantiate the base class for Rect and RectF classes.
 #if !defined(UI_IMPLEMENTATION)
 #error "This file is intended for UI implementation only"
 #endif
 
 namespace {
 
 template<typename Type>
@@ skipping 289 matching lines @@
          typename Type>
 bool RectBase<Class, PointClass, SizeClass, InsetsClass, VectorClass, Type>::
     SharesEdgeWith(const Class& rect) const {
   return (y() == rect.y() && height() == rect.height() &&
              (x() == rect.right() || right() == rect.x())) ||
          (x() == rect.x() && width() == rect.width() &&
              (y() == rect.bottom() || bottom() == rect.y()));
 }
 
 }  // namespace gfx