Update ToLower/UpperASCII API

ui/base/ime/chromeos/input_method_descriptor.cc

 // Copyright 2013 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 "ui/base/ime/chromeos/input_method_descriptor.h"
 
 #include <sstream>
 
 #include "base/logging.h"
 #include "base/strings/string_split.h"
@@ skipping 27 matching lines @@
   // TODO(nona): Investigate better way to guess the preferred layout
   //             http://crbug.com/170601.
   return keyboard_layouts_.empty() ? "us" : keyboard_layouts_[0];
 }
 
 std::string InputMethodDescriptor::GetIndicator() const {
   // If indicator is empty, use the first two character in its preferred
   // 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_;
 }
 
 InputMethodDescriptor::InputMethodDescriptor() {
 }
 
 InputMethodDescriptor::~InputMethodDescriptor() {
 }
 
 }  // namespace input_method
 }  // namespace chromeos