[Bluetooth] Use base::ToLowerASCII() rather than tolower(), as the later is locale-sensitive.

device/bluetooth/bluetooth_uuid.cc

 // Copyright 2014 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 "device/bluetooth/bluetooth_uuid.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 
@@ skipping 24 matching lines @@
   if (!(uuid.size() == 4 || uuid.size() == 8 || uuid.size() == 36))
     return;
 
   for (size_t i = 0; i < uuid.size(); ++i) {
     if (i == 8 || i == 13 || i == 18 || i == 23) {
       if (uuid[i] != '-')
         return;
     } else {
       if (!IsHexDigit(uuid[i]))
         return;
-      uuid[i] = tolower(uuid[i]);
+      uuid[i] = base::ToLowerASCII(uuid[i]);
     }
   }
 
   canonical->assign(uuid);
   if (uuid.size() == 4) {
     canonical_128->assign(kCommonUuidPrefix + uuid + kCommonUuidPostfix);
     *format = BluetoothUUID::kFormat16Bit;
   } else if (uuid.size() == 8) {
     canonical_128->assign(uuid + kCommonUuidPostfix);
     *format = BluetoothUUID::kFormat32Bit;
@@ skipping 30 matching lines @@
 
 bool BluetoothUUID::operator!=(const BluetoothUUID& uuid) const {
   return canonical_value_ != uuid.canonical_value_;
 }
 
 void PrintTo(const BluetoothUUID& uuid, std::ostream* out) {
   *out << uuid.canonical_value();
 }
 
 }  // namespace device