[Cleanup] Remove StringPrintf from global namespace

chrome/browser/extensions/api/font_settings/font_settings_api.cc

Index: chrome/browser/extensions/api/font_settings/font_settings_api.cc
diff --git a/chrome/browser/extensions/api/font_settings/font_settings_api.cc b/chrome/browser/extensions/api/font_settings/font_settings_api.cc
index d56ff7fc6ab642025f7b03fdced7b941773d2180..0c2b0cb30bad92e544941d97d532c927c915c4b3 100644
--- a/chrome/browser/extensions/api/font_settings/font_settings_api.cc
+++ b/chrome/browser/extensions/api/font_settings/font_settings_api.cc
@@ -67,9 +67,9 @@ std::string GetFontNamePrefPath(fonts::GenericFamily generic_family_enum,
   if (script.empty())
     script = prefs::kWebKitCommonScript;
   std::string generic_family = fonts::ToString(generic_family_enum);
-  return StringPrintf(kWebKitFontPrefFormat,
-                      generic_family.c_str(),
-                      script.c_str());
+  return base::StringPrintf(kWebKitFontPrefFormat,
+                            generic_family.c_str(),
+                            script.c_str());
 }
 
 // Returns the localized name of a font so that it can be matched within the