base: Fix the TODO in string_util.h

chrome/browser/ui/webui/ntp/favicon_webui_handler.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/webui/ntp/favicon_webui_handler.h"
 
 #include "base/callback.h"
 #include "base/string_util.h"
+#include "base/stringprintf.h"
 #include "base/values.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/url_constants.h"
 #include "grit/ui_resources.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/codec/png_codec.h"
 #include "ui/gfx/color_analysis.h"
 
 FaviconWebUIHandler::FaviconWebUIHandler() {
 }
@@ skipping 53 matching lines @@
                                                SkColorGetG(color),
                                                SkColorGetB(color));
     color_value.reset(new StringValue(css_color));
   } else {
     color_value.reset(new StringValue("#919191"));
   }
 
   web_ui_->CallJavascriptFunction(callbacks_map_[id], id_value, *color_value);
   callbacks_map_.erase(id);
 }