Move IsStringASCII/UTF8 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 26ef191816f50a4e3031549e0f1ba572076b8413..67c35f97bb98b6e28d629e5e4b12091bb7ed6d8d 100644
--- a/chrome/app/chrome_main_delegate.cc
+++ b/chrome/app/chrome_main_delegate.cc
@@ -337,7 +337,7 @@ 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);
     }
   }