Update HTTP/2 NPN/ALPN tokens to "h2-12" to advertise draft 12 support.

net/socket/ssl_client_socket.cc

Index: net/socket/ssl_client_socket.cc
diff --git a/net/socket/ssl_client_socket.cc b/net/socket/ssl_client_socket.cc
index 588ded4ca2ce76c33afab5b67200e9d793f8ff90..1b2fe144304955bd0c423aca96d90226c45d7f4a 100644
--- a/net/socket/ssl_client_socket.cc
+++ b/net/socket/ssl_client_socket.cc
@@ -32,8 +32,8 @@ NextProto SSLClientSocket::NextProtoFromString(
     return kProtoSPDY3;
   } else if (proto_string == "spdy/3.1") {
     return kProtoSPDY31;
-  } else if (proto_string == "h2-11") {
-    // This is the HTTP/2 draft 11 identifier. For internal
+  } else if (proto_string == "h2-12") {
+    // This is the HTTP/2 draft 12 identifier. For internal
     // consistency, HTTP/2 is named SPDY4 within Chromium.
     return kProtoSPDY4;
   } else if (proto_string == "quic/1+spdy/3") {
@@ -55,9 +55,9 @@ const char* SSLClientSocket::NextProtoToString(NextProto next_proto) {
     case kProtoSPDY31:
       return "spdy/3.1";
     case kProtoSPDY4:
-      // This is the HTTP/2 draft 11 identifier. For internal
+      // This is the HTTP/2 draft 12 identifier. For internal
       // consistency, HTTP/2 is named SPDY4 within Chromium.
-      return "h2-11";
+      return "h2-12";
     case kProtoQUIC1SPDY3:
       return "quic/1+spdy/3";
     case kProtoUnknown: