Replace ToLower calls to the new format

components/audio_modem/modem_impl.cc

 // Copyright 2015 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 "components/audio_modem/modem_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <vector>
 
@@ skipping 44 matching lines @@
   if (audio_type == AUDIBLE)
     return "audible";
   if (audio_type == INAUDIBLE)
     return "inaudible";
 
   NOTREACHED() << "Got unexpected token type " << audio_type;
   return std::string();
 }
 
 bool ReadBooleanFlag(const std::string& flag, bool default_value) {
-  const std::string flag_value = base::StringToLowerASCII(
+  const std::string flag_value = base::ToLowerASCII(
       base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(flag));
   if (flag_value == "true" || flag_value == "1")
     return true;
   if (flag_value == "false" || flag_value == "0")
     return false;
   LOG_IF(ERROR, !flag_value.empty())
       << "Unrecognized value \"" << flag_value << " for flag "
       << flag << ". Defaulting to " << default_value;
   return default_value;
 }
@@ skipping 255 matching lines @@
   file_str = base::SysWideToNativeMB(file_path.value());
 #else
   file_str = dump_tokens_dir_.Append(filename).value();
 #endif
 
   webrtc::WavWriter writer(file_str, kDefaultSampleRate, kMonoChannelCount);
   writer.WriteSamples(int_samples.data(), int_samples.size());
 }
 
 }  // namespace audio_modem