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

ui/base/cursor/cursor_loader.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.
 
 #ifndef UI_BASE_CURSOR_CURSOR_LOADER_H_
 #define UI_BASE_CURSOR_CURSOR_LOADER_H_
 
 #include "base/logging.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "ui/base/ui_export.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
 
 namespace ui {
 
 class UI_EXPORT CursorLoader {
  public:
   CursorLoader() : scale_(1.f) {}
@@ skipping 53 matching lines @@
 
   // The current scale of the mouse cursor icon.
   float scale_;
 
   DISALLOW_COPY_AND_ASSIGN(CursorLoader);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_CURSOR_CURSOR_LOADER_H_