ui/gfx: Use base::string16 now that string16 was moved into base namespace.

ui/gfx/font_fallback_win.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/gfx/font_fallback_win.h"
 
 #include <map>
 
 #include "base/memory/singleton.h"
 #include "base/string_util.h"
@@ skipping 30 matching lines @@
   std::map<std::string, std::string>::const_iterator it =
       font_map->find(StringToLowerASCII(filename));
   if (it == font_map->end())
     return;
 
   internal::ParseFontFamilyString(it->second, font_names);
 }
 
 // Returns true if |text| contains only ASCII digits.
 bool ContainsOnlyDigits(const std::string& text) {
-  return text.find_first_not_of("0123456789") == string16::npos;
+  return text.find_first_not_of("0123456789") == base::string16::npos;
 }
 
 // Appends a Font with the given |name| and |size| to |fonts| unless the last
 // entry is already a font with that name.
 void AppendFont(const std::string& name, int size, std::vector<Font>* fonts) {
   if (fonts->empty() || fonts->back().GetFontName() != name)
     fonts->push_back(Font(name, size));
 }
 
 // Queries the registry to get a list of linked fonts for |font|.
@@ skipping 172 matching lines @@
   // Note: One possibility would be to always merge both lists of fonts,
   //       but it is not clear whether there are any real world scenarios
   //       where this would actually help.
   if (fonts->empty())
     fonts = font_link->GetLinkedFonts(current_font_);
 
   return fonts;
 }
 
 }  // namespace gfx