Update from https://crrev.com/311076

net/socket/next_proto.cc

Index: net/socket/next_proto.cc
diff --git a/net/socket/next_proto.cc b/net/socket/next_proto.cc
index 0d1b40095336b0bd68c0d14517aedf40021ca347..6d6f563801b74551177e5cd2618350ee45e21837 100644
--- a/net/socket/next_proto.cc
+++ b/net/socket/next_proto.cc
@@ -17,7 +17,6 @@ NextProtoVector NextProtosDefaults() {
   next_protos.push_back(kProtoHTTP11);
   next_protos.push_back(kProtoSPDY31);
   next_protos.push_back(kProtoSPDY4_14);
-  next_protos.push_back(kProtoSPDY4_15);
   return next_protos;
 }
 
@@ -30,7 +29,6 @@ NextProtoVector NextProtosWithSpdyAndQuic(bool spdy_enabled,
   if (spdy_enabled) {
     next_protos.push_back(kProtoSPDY31);
     next_protos.push_back(kProtoSPDY4_14);
-    next_protos.push_back(kProtoSPDY4_15);
   }
   return next_protos;
 }
@@ -49,7 +47,6 @@ NextProtoVector NextProtosSpdy4Http2() {
   next_protos.push_back(kProtoQUIC1SPDY3);
   next_protos.push_back(kProtoSPDY31);
   next_protos.push_back(kProtoSPDY4_14);
-  next_protos.push_back(kProtoSPDY4_15);
   return next_protos;
 }