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

ui/aura/test/test_windows.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_windows.h"
 
-#include "base/string_number_conversions.h"
+#include "base/strings/string_number_conversions.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/rect.h"
 
 namespace aura {
 namespace test {
 
 Window* CreateTestWindowWithId(int id, Window* parent) {
   return CreateTestWindowWithDelegate(NULL, id, gfx::Rect(), parent);
@@ skipping 66 matching lines @@
        i != parent->children().end(); ++i) {
     if (!result.empty())
       result += " ";
     result += base::IntToString((*i)->id());
   }
   return result;
 }
 
 }  // namespace test
 }  // namespace aura