Leftovers from wstring->string16 conversion in authentication code.

net/http/http_auth_handler_ntlm.cc

Index: net/http/http_auth_handler_ntlm.cc
diff --git a/net/http/http_auth_handler_ntlm.cc b/net/http/http_auth_handler_ntlm.cc
index 3191df6e992f6d9213b02887ed4714ceb4b097ba..9032bb579c3a0d4f1534387c91c106bece559d1b 100644
--- a/net/http/http_auth_handler_ntlm.cc
+++ b/net/http/http_auth_handler_ntlm.cc
@@ -38,8 +38,9 @@ int HttpAuthHandlerNTLM::GenerateAuthTokenImpl(
   // components.
   string16 domain;
   string16 user;
-  size_t backslash_idx = username->find(L'\\');
-  if (backslash_idx == std::wstring::npos) {
+  const char16 backslash_character = '\\';
+  size_t backslash_idx = username->find(backslash_character);
+  if (backslash_idx == string16::npos) {
     user = *username;
   } else {
     domain = username->substr(0, backslash_idx);