ui/gfx: Remove an unnecessary include from font_list.h

ui/gfx/font_list.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_GFX_FONT_LIST_H_
 #define UI_GFX_FONT_LIST_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
-#include "base/gtest_prod_util.h"
 #include "ui/base/ui_export.h"
 #include "ui/gfx/font.h"
 
 namespace gfx {
 
 // FontList represents a list of fonts either in the form of Font vector or in
 // the form of a string representing font names, styles, and size.
 //
 // The string representation is in the form "FAMILY_LIST [STYLE_OPTIONS] SIZE",
 // where FAMILY_LIST is a comma separated list of families terminated by a
@@ skipping 58 matching lines @@
   // format.
   // If FontList is constructed with a vector of font,
   // |font_description_string_| is not initialized during construction. Instead,
   // it is computed lazily when user asked to get the font description string.
   mutable std::string font_description_string_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_FONT_LIST_H_