iwyu: Include stringprintf.h where appropriate, part 2.

chrome/browser/ui/webui/options/language_options_handler_common.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/options/language_options_handler_common.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
+#include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/spellcheck_common.h"
 #include "content/browser/user_metrics.h"
 #include "grit/chromium_strings.h"
@@ skipping 115 matching lines @@
 
 void LanguageOptionsHandlerCommon::LanguageOptionsOpenCallback(
     const ListValue* args) {
   UserMetrics::RecordAction(UserMetricsAction("LanguageOptions_Open"));
 }
 
 void LanguageOptionsHandlerCommon::UiLanguageChangeCallback(
     const ListValue* args) {
   const std::string language_code = UTF16ToASCII(ExtractStringValue(args));
   CHECK(!language_code.empty());
-  const std::string action = StringPrintf(
+  const std::string action = base::StringPrintf(
       "LanguageOptions_UiLanguageChange_%s", language_code.c_str());
   UserMetrics::RecordComputedAction(action);
   SetApplicationLocale(language_code);
     web_ui_->CallJavascriptFunction("options.LanguageOptions.uiLanguageSaved");
 }
 
 void LanguageOptionsHandlerCommon::SpellCheckLanguageChangeCallback(
     const ListValue* args) {
   const std::string language_code = UTF16ToASCII(ExtractStringValue(args));
   CHECK(!language_code.empty());
-  const std::string action = StringPrintf(
+  const std::string action = base::StringPrintf(
       "LanguageOptions_SpellCheckLanguageChange_%s", language_code.c_str());
   UserMetrics::RecordComputedAction(action);
 }