[SPDY] Incorporate latest framing changes from HTTP2 into SPDY 4 as SPDY 4a2.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index a6158fd69c57df1e4326b3e9856ac82d01966ce3..47d6184fe045d7e58aca1abe05f1f47773ab5d30 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -637,8 +637,8 @@ const char kEnableSdch[]                    = "enable-sdch";
 // Disable SPDY/3.1. This is a temporary testing flag.
 const char kDisableSpdy31[]                 = "disable-spdy31";
 
-// Enable SPDY/4 alpha 1. This is a temporary testing flag.
-const char kEnableSpdy4a1[]                 = "enable-spdy4a1";
+// Enable SPDY/4 alpha 2. This is a temporary testing flag.
+const char kEnableSpdy4a2[]                 = "enable-spdy4a2";
 
 // Enable SPDY CREDENTIAL frame support.  This is a temporary testing flag.
 const char kEnableSpdyCredentialFrames[]    = "enable-spdy-credential-frames";