Make SpdyFrame::size a constant instead of a static method so gcc can optimize the call away.

net/spdy/spdy_session.h

Index: net/spdy/spdy_session.h
diff --git a/net/spdy/spdy_session.h b/net/spdy/spdy_session.h
index b5b7dc79e19c60538066a1cac7c5daf1382298f7..f46e03f813259acad71d540204f15204387bc796 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -37,7 +37,7 @@ namespace net {
 // somewhat arbitrary, but is reasonably small and ensures that we elicit
 // ACKs quickly from TCP (because TCP tries to only ACK every other packet).
 const int kMss = 1430;
-const int kMaxSpdyFrameChunkSize = (2 * kMss) - spdy::SpdyFrame::size();
+const int kMaxSpdyFrameChunkSize = (2 * kMss) - spdy::SpdyFrame::kHeaderSize;
 
 class BoundNetLog;
 class SpdySettingsStorage;