Replace ToLower calls to the new format

chrome/renderer/plugins/plugin_uma.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 "chrome/renderer/plugins/plugin_uma.h"
 
 #include <algorithm>
 #include <cstring>
 
 #include "base/metrics/histogram.h"
@@ skipping 88 matching lines @@
   if (extension_file_path.empty())
     extension_file_path = src.host();
 
   size_t last_dot = extension_file_path.find_last_of('.');
   if (last_dot != std::string::npos) {
     *extension = extension_file_path.substr(last_dot);
   } else {
     extension->clear();
   }
 
-  base::StringToLowerASCII(extension);
+  *extension = base::ToLowerASCII(*extension);
 }
 
 PluginUMAReporter::PluginType PluginUMAReporter::GetPluginType(
     const std::string& plugin_mime_type,
     const GURL& plugin_src) {
   // If we know plugin's mime type, we use it to determine plugin's type. Else,
   // we try to determine plugin type using plugin source's extension.
   if (!plugin_mime_type.empty())
-    return MimeTypeToPluginType(base::StringToLowerASCII(plugin_mime_type));
+    return MimeTypeToPluginType(base::ToLowerASCII(plugin_mime_type));
 
   return SrcToPluginType(plugin_src);
 }
 
 PluginUMAReporter::PluginType PluginUMAReporter::SrcToPluginType(
     const GURL& src) {
   std::string file_extension;
   ExtractFileExtension(src, &file_extension);
   if (CStringArrayContainsCString(kWindowsMediaPlayerExtensions,
                                   arraysize(kWindowsMediaPlayerExtensions),
@@ skipping 49 matching lines @@
     return SHOCKWAVE_FLASH;
   }
 
 #if defined(ENABLE_PEPPER_CDMS)
   if (mime_type == kWidevineCdmPluginMimeType)
     return WIDEVINE_CDM;
 #endif
 
   return UNSUPPORTED_MIMETYPE;
 }