Update some uses of char16 to use the base:: namespace.

net/dns/dns_config_service_win.cc

Index: net/dns/dns_config_service_win.cc
diff --git a/net/dns/dns_config_service_win.cc b/net/dns/dns_config_service_win.cc
index 15ae22227f7ccf55755f89cf66dd69b3184baa8a..64b912db367cb4a958eec2e163cf52b8a35e0170 100644
--- a/net/dns/dns_config_service_win.cc
+++ b/net/dns/dns_config_service_win.cc
@@ -146,7 +146,7 @@ bool ParseDomainASCII(const base::string16& widestr, std::string* domain) {
 
   // Otherwise try to convert it from IDN to punycode.
   const int kInitialBufferSize = 256;
-  url_canon::RawCanonOutputT<char16, kInitialBufferSize> punycode;
+  url_canon::RawCanonOutputT<base::char16, kInitialBufferSize> punycode;
   if (!url_canon::IDNToASCII(widestr.data(), widestr.length(), &punycode))
     return false;