Remove SPDY 2.1 support.

net/http/http_stream_factory.cc

Index: net/http/http_stream_factory.cc
diff --git a/net/http/http_stream_factory.cc b/net/http/http_stream_factory.cc
index aff2d09bef62a1dc86fe5bf5111d961363b8197e..2d87bc73527459c6d5ee2385f3afeb3a7d56875f 100644
--- a/net/http/http_stream_factory.cc
+++ b/net/http/http_stream_factory.cc
@@ -169,20 +169,10 @@ void HttpStreamFactory::EnableNpnHttpOnly() {
 }
 
 // static
-void HttpStreamFactory::EnableFlowControl() {
-  std::vector<std::string> next_protos;
-  next_protos.push_back("http/1.1");
-  next_protos.push_back("spdy/2");
-  next_protos.push_back("spdy/2.1");
-  SetNextProtos(next_protos);
-}
-
-// static
 void HttpStreamFactory::EnableNpnSpdy3() {
   std::vector<std::string> next_protos;
   next_protos.push_back("http/1.1");
   next_protos.push_back("spdy/2");
-  next_protos.push_back("spdy/2.1");
   next_protos.push_back("spdy/3");
   SetNextProtos(next_protos);
 }
@@ -204,8 +194,6 @@ void HttpStreamFactory::SetNextProtos(const std::vector<std::string>& value) {
       enabled_protocols_[NPN_SPDY_1] = true;
     } else if (value[i] == "spdy/2") {
       enabled_protocols_[NPN_SPDY_2] = true;
-    } else if (value[i] == "spdy/2.1") {
-      enabled_protocols_[NPN_SPDY_21] = true;
     } else if (value[i] == "spdy/3") {
       enabled_protocols_[NPN_SPDY_3] = true;
     }