Stop using SpdySynStreamIR for SPDY 4.

net/spdy/buffered_spdy_framer_unittest.cc

Index: net/spdy/buffered_spdy_framer_unittest.cc
diff --git a/net/spdy/buffered_spdy_framer_unittest.cc b/net/spdy/buffered_spdy_framer_unittest.cc
index 08e40e3f36e3f7bc7f756831211f3eddcc24dbd7..ef5576ae8cd5443aeb307c6a7ab057fc36ef3f81 100644
--- a/net/spdy/buffered_spdy_framer_unittest.cc
+++ b/net/spdy/buffered_spdy_framer_unittest.cc
@@ -226,6 +226,10 @@ TEST_P(BufferedSpdyFramerTest, OnSetting) {
 }
 
 TEST_P(BufferedSpdyFramerTest, ReadSynStreamHeaderBlock) {
+  if (spdy_version() > SPDY3) {
+    // SYN_STREAM not supported in SPDY>3.
+    return;
+  }
   SpdyHeaderBlock headers;
   headers["aa"] = "vv";
   headers["bb"] = "ww";
@@ -252,6 +256,7 @@ TEST_P(BufferedSpdyFramerTest, ReadSynStreamHeaderBlock) {
 
 TEST_P(BufferedSpdyFramerTest, ReadSynReplyHeaderBlock) {
   if (spdy_version() > SPDY3) {
+    // SYN_REPLY not supported in SPDY>3.
     return;
   }
   SpdyHeaderBlock headers;