Cleanup: Remove wstring methods from base::Pickle.

ipc/ipc_message_utils.cc

Index: ipc/ipc_message_utils.cc
diff --git a/ipc/ipc_message_utils.cc b/ipc/ipc_message_utils.cc
index 7368a0db22101222f067a6ef5350c27fe6238caf..b58dce93813f835987acfd3d4e74383576bbf8a4 100644
--- a/ipc/ipc_message_utils.cc
+++ b/ipc/ipc_message_utils.cc
@@ -343,15 +343,9 @@ 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()) {