Replace ToLower calls to the new format

base/i18n/rtl.cc

 // Copyright (c) 2011 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 "base/i18n/rtl.h"
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_util.h"
@@ skipping 18 matching lines @@
   const char* variant = locale.getVariant();
 
   std::string result =
       (language != NULL && *language != '\0') ? language : "und";
 
   if (country != NULL && *country != '\0') {
     result += '-';
     result += country;
   }
 
-  if (variant != NULL && *variant != '\0') {
-    std::string variant_str(variant);
-    base::StringToLowerASCII(&variant_str);
-    result += '@' + variant_str;
-  }
+  if (variant != NULL && *variant != '\0')
+    result += '@' + base::ToLowerASCII(variant);
 
   return result;
 }
 
 // Returns LEFT_TO_RIGHT or RIGHT_TO_LEFT if |character| has strong
 // directionality, returns UNKNOWN_DIRECTION if it doesn't. Please refer to
 // http://unicode.org/reports/tr9/ for more information.
 base::i18n::TextDirection GetCharacterDirection(UChar32 character) {
   // Now that we have the character, we use ICU in order to query for the
   // appropriate Unicode BiDi character type.
@@ skipping 352 matching lines @@
       begin == kRightToLeftOverride)
     ++begin_index;
   size_t end_index = text.length() - 1;
   if (text[end_index] == kPopDirectionalFormatting)
     --end_index;
   return text.substr(begin_index, end_index - begin_index + 1);
 }
 
 }  // namespace i18n
 }  // namespace base