Introduce new SPDY Version UMA histogram.

net/spdy/spdy_test_util_common.cc

Index: net/spdy/spdy_test_util_common.cc
diff --git a/net/spdy/spdy_test_util_common.cc b/net/spdy/spdy_test_util_common.cc
index 73d0afcbbb724555f894e55279e8a9f70965a6e3..3acb87b2705196cddc60100d2f163a49c8a34d73 100644
--- a/net/spdy/spdy_test_util_common.cc
+++ b/net/spdy/spdy_test_util_common.cc
@@ -53,9 +53,12 @@ void ParseUrl(base::StringPiece url, std::string* scheme, std::string* host,
 
 NextProtoVector SpdyNextProtos() {
   NextProtoVector next_protos;
-  for (int i = kProtoMinimumVersion; i <= kProtoMaximumVersion; ++i) {
-    next_protos.push_back(static_cast<NextProto>(i));
-  }
+  next_protos.push_back(kProtoHTTP11);
+  next_protos.push_back(kProtoDeprecatedSPDY2);
+  next_protos.push_back(kProtoSPDY3);
+  next_protos.push_back(kProtoSPDY31);
+  next_protos.push_back(kProtoSPDY4);
+  next_protos.push_back(kProtoQUIC1SPDY3);
   return next_protos;
 }