Move WriteInto to base namespace.

net/quic/crypto/channel_id_chromium.cc

Index: net/quic/crypto/channel_id_chromium.cc
diff --git a/net/quic/crypto/channel_id_chromium.cc b/net/quic/crypto/channel_id_chromium.cc
index ab50efa8e1f79ff9f897e2842fac3e319b89fabe..a4d6d919c5542518711bebea9286ee322a088dc6 100644
--- a/net/quic/crypto/channel_id_chromium.cc
+++ b/net/quic/crypto/channel_id_chromium.cc
@@ -44,7 +44,7 @@ bool ChannelIDKeyChromium::Sign(base::StringPiece signed_data,
   if (!sig_creator->DecodeSignature(der_signature, &raw_signature)) {
     return false;
   }
-  memcpy(WriteInto(out_signature, raw_signature.size() + 1),
+  memcpy(base::WriteInto(out_signature, raw_signature.size() + 1),
          &raw_signature[0], raw_signature.size());
   return true;
 }