Replace ToLower calls to the new format

chrome/browser/ui/webui/extensions/extension_icon_source.cc

 // Copyright (c) 2012 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/browser/ui/webui/extensions/extension_icon_source.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/stl_util.h"
@@ skipping 259 matching lines @@
     LoadFaviconImage(request_id);
   else
     LoadDefaultImage(request_id);
 }
 
 bool ExtensionIconSource::ParseData(
     const std::string& path,
     int request_id,
     const content::URLDataSource::GotDataCallback& callback) {
   // Extract the parameters from the path by lower casing and splitting.
-  std::string path_lower = base::StringToLowerASCII(path);
+  std::string path_lower = base::ToLowerASCII(path);
   std::vector<std::string> path_parts = base::SplitString(
       path_lower, "/", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
   if (path_lower.empty() || path_parts.size() < 3)
     return false;
 
   std::string size_param = path_parts.at(1);
   std::string match_param = path_parts.at(2);
   match_param = match_param.substr(0, match_param.find('?'));
 
   int size;
@@ skipping 50 matching lines @@
   std::map<int, ExtensionIconRequest*>::iterator i =
       request_map_.find(request_id);
   if (i == request_map_.end())
     return;
 
   delete i->second;
   request_map_.erase(i);
 }
 
 }  // namespace extensions