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

ui/views/examples/slider_example.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/views/examples/slider_example.h"
 
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/view.h"
 
 namespace views {
 namespace examples {
 
 SliderExample::SliderExample()
     : ExampleBase("Slider"),
@@ skipping 18 matching lines @@
 void SliderExample::SliderValueChanged(Slider* sender,
                                        float value,
                                        float old_value,
                                        SliderChangeReason reason) {
   label_->SetText(ASCIIToUTF16(base::StringPrintf("%.3lf", value)));
 }
 
 }  // namespace examples
 }  // namespace views