Use a direct include of strings headers in ui/, part 1.

ui/aura/test/test_window_delegate.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/aura/test/test_window_delegate.h"
 
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "ui/aura/window.h"
 #include "ui/base/events/event.h"
 #include "ui/base/hit_test.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/path.h"
 #include "ui/gfx/skia_util.h"
 
 namespace aura {
 namespace test {
 
@@ skipping 189 matching lines @@
   std::string result = base::StringPrintf("%d %d",
                                           key_press_count_,
                                           key_release_count_);
   key_press_count_ = 0;
   key_release_count_ = 0;
   return result;
 }
 
 }  // namespace test
 }  // namespace aura