Replace ToLower calls to the new format

components/device_event_log/device_event_log_impl.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 "components/device_event_log/device_event_log_impl.h"
 
 #include <cmath>
 #include <list>
 #include <set>
 
@@ skipping 202 matching lines @@
     if (tok == "level")
       *show_level = true;
     if (tok == "html")
       *format_html = true;
     if (tok == "json")
       *format_json = true;
   }
 }
 
 LogType LogTypeFromString(const std::string& desc) {
-  std::string desc_lc = base::StringToLowerASCII(desc);
+  std::string desc_lc = base::ToLowerASCII(desc);
   if (desc_lc == "network")
     return LOG_TYPE_NETWORK;
   if (desc_lc == "power")
     return LOG_TYPE_POWER;
   if (desc_lc == "login")
     return LOG_TYPE_LOGIN;
   NOTREACHED() << "Unrecogized LogType: " << desc;
   return LOG_TYPE_UNKNOWN;
 }
 
@@ skipping 190 matching lines @@
   if (filedesc) {
     file = filedesc;
     size_t last_slash_pos = file.find_last_of("\\/");
     if (last_slash_pos != std::string::npos) {
       file.erase(0, last_slash_pos + 1);
     }
   }
 }
 
 }  // namespace device_event_log