Update includes and delete remaining strings forwarding headers.

ppapi/native_client/src/trusted/plugin/nacl_http_response_headers.cc

 // Copyright 2013 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 "native_client/src/trusted/plugin/nacl_http_response_headers.h"
 
 #include <algorithm>
 #include <sstream>
 
 namespace {
 
-// TODO(jvoung) use Tokenize from base/string_util.h when this moves
-// to chromium.
+// TODO(jvoung): Use Tokenize from base/strings/string_util.h when this moves
+// to Chromium.
 void SplitString(const std::string& str,
                  char delim,
                  std::vector<std::string>* elems) {
   std::stringstream ss(str);
   std::string item;
   while (std::getline(ss, item, delim)) {
     elems->push_back(item);
   }
 }
 
@@ skipping 74 matching lines @@
       std::string cc = entry.second;
       std::transform(cc.begin(), cc.end(), cc.begin(), ::tolower);
       if (entry.second.find("no-store") != std::string::npos)
         return true;
     }
   }
   return false;
 }
 
 }  // namespace plugin