Update ToLower/UpperASCII API

ui/base/ime/chromeos/input_method_descriptor.cc

Index: ui/base/ime/chromeos/input_method_descriptor.cc
diff --git a/ui/base/ime/chromeos/input_method_descriptor.cc b/ui/base/ime/chromeos/input_method_descriptor.cc
index 19d6ccadbc06918b4631950cb5353726a52d5b2a..eda8aa6b9a66d625b75c9e46ee70ed16685792b4 100644
--- a/ui/base/ime/chromeos/input_method_descriptor.cc
+++ b/ui/base/ime/chromeos/input_method_descriptor.cc
@@ -45,11 +45,10 @@ std::string InputMethodDescriptor::GetIndicator() const {
   // keyboard layout or language code.
   if (indicator_.empty()) {
     if (extension_ime_util::IsKeyboardLayoutExtension(id_)) {
-      return base::StringToUpperASCII(
-          GetPreferredKeyboardLayout().substr(0, 2));
+      return base::ToUpperASCII(GetPreferredKeyboardLayout().substr(0, 2));
     }
     DCHECK(language_codes_.size() > 0);
-    return base::StringToUpperASCII(language_codes_[0].substr(0, 2));
+    return base::ToUpperASCII(language_codes_[0].substr(0, 2));
   }
   return indicator_;
 }