Move IsStringUTF8/ASCII to base namespace

chrome/app/chrome_main_delegate.cc

Index: chrome/app/chrome_main_delegate.cc
diff --git a/chrome/app/chrome_main_delegate.cc b/chrome/app/chrome_main_delegate.cc
index 6e93a8f424e9464ff4ebfb14bdc990712b736d35..2c29876e12127c4fc8c9865470a817a0527fb0c0 100644
--- a/chrome/app/chrome_main_delegate.cc
+++ b/chrome/app/chrome_main_delegate.cc
@@ -339,7 +339,7 @@ void InitializeUserDataDir() {
     std::string user_data_dir_string;
     scoped_ptr<base::Environment> environment(base::Environment::Create());
     if (environment->GetVar("CHROME_USER_DATA_DIR", &user_data_dir_string) &&
-        IsStringUTF8(user_data_dir_string)) {
+        base::IsStringUTF8(user_data_dir_string)) {
       user_data_dir = base::FilePath::FromUTF8Unsafe(user_data_dir_string);
     }
   }