Remove SPDY priority #defines from spdy_protocol.h since they differ between SPDY 2 and SPDY 3.

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 3ea3d14cf15dd0089ce59976cbc89d87200eeeb1..a74c399eb3775edb30d9278fb3d28d1560fd2a84 100644
--- a/net/spdy/spdy_protocol.h
+++ b/net/spdy/spdy_protocol.h
@@ -411,6 +411,7 @@ enum SpdySettingsIds {
 };
 
 // Status codes, as used in control frames (primarily RST_STREAM).
+// TODO(hkhalil): Rename to SpdyRstStreamStatus
 enum SpdyStatusCodes {
   INVALID = 0,
   PROTOCOL_ERROR = 1,
@@ -443,10 +444,6 @@ typedef uint32 SpdyStreamId;
 // number between 0 and 3.
 typedef uint8 SpdyPriority;
 
-// SPDY Priorities. (there are only 2 bits)
-#define SPDY_PRIORITY_LOWEST 3
-#define SPDY_PRIORITY_HIGHEST 0
-
 // -------------------------------------------------------------------------
 // These structures mirror the protocol structure definitions.