Remove the origin field from the CREDENTIAL frame.

net/spdy/spdy_protocol.h

Index: net/spdy/spdy_protocol.h
diff --git a/net/spdy/spdy_protocol.h b/net/spdy/spdy_protocol.h
index fa489b8f8e08c6a0dd860fa648bee768f5dd9135..76ee10ab252cf21189e103b6c4af0f8616a3acb7 100644
--- a/net/spdy/spdy_protocol.h
+++ b/net/spdy/spdy_protocol.h
@@ -130,10 +130,8 @@
 //  +----------------------------------+
 //  | flags (8)  |  Length (24 bits)   | >= 12
 //  +----------------------------------+
-//  |  Slot (16 bits) | Origin Len (16)|
-//  +----------------------------------+
-//  |              Origin              |
-//  +----------------------------------+
+//  |  Slot (16 bits) |                |
+//  +-----------------+                |
 //  |      Proof Length (32 bits)      |
 //  +----------------------------------+
 //  |               Proof              |
@@ -314,10 +312,8 @@ struct SpdyPingControlFrameBlock : SpdyFrameBlock {
 // A CREDENTIAL Control Frame structure.
 struct SpdyCredentialControlFrameBlock : SpdyFrameBlock {
   uint16 slot_;
-  uint16 origin_len_;
   uint32 proof_len_;
   // Variable data here.
-  // origin data
   // proof data
   // for each certificate: unit32 certificate_len + certificate_data[i]
 };