Cleanup: Remove wstring methods from base::Pickle.

ipc/ipc_message_utils.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 "ipc/ipc_message_utils.h"
 
 #include "base/files/file_path.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/nullable_string16.h"
@@ skipping 325 matching lines @@
 
 void ParamTraits<double>::Log(const param_type& p, std::string* l) {
   l->append(base::StringPrintf("%e", p));
 }
 
 
 void ParamTraits<std::string>::Log(const param_type& p, std::string* l) {
   l->append(p);
 }
 
-void ParamTraits<std::wstring>::Log(const param_type& p, std::string* l) {
-  l->append(base::WideToUTF8(p));
-}
-
-#if !defined(WCHAR_T_IS_UTF16)
 void ParamTraits<base::string16>::Log(const param_type& p, std::string* l) {
   l->append(base::UTF16ToUTF8(p));
 }
-#endif
 
 void ParamTraits<std::vector<char> >::Write(Message* m, const param_type& p) {
   if (p.empty()) {
     m->WriteData(NULL, 0);
   } else {
     m->WriteData(&p.front(), static_cast<int>(p.size()));
   }
 }
 
 bool ParamTraits<std::vector<char> >::Read(const Message* m,
@@ skipping 470 matching lines @@
   return result;
 }
 
 void ParamTraits<MSG>::Log(const param_type& p, std::string* l) {
   l->append("<MSG>");
 }
 
 #endif  // OS_WIN
 
 }  // namespace IPC