SPDY: WriteHeaders should not invoke OnDataSent callback

net/spdy/spdy_http_stream.cc

Index: net/spdy/spdy_http_stream.cc
diff --git a/net/spdy/spdy_http_stream.cc b/net/spdy/spdy_http_stream.cc
index 987f9eb0b4db60d2f503ec4aec7dd85a51d57bac..df0909f8217b41f29b1867718ba00fac1a63991e 100644
--- a/net/spdy/spdy_http_stream.cc
+++ b/net/spdy/spdy_http_stream.cc
@@ -411,6 +411,11 @@ int SpdyHttpStream::OnResponseReceived(const SpdyHeaderBlock& response,
   return status;
 }
 
+void SpdyHttpStream::OnHeadersSent() {
+  // For HTTP streams, no HEADERS frame is sent from the client.
+  NOTREACHED();
+}
+
 void SpdyHttpStream::OnDataReceived(const char* data, int length) {
   // SpdyStream won't call us with data if the header block didn't contain a
   // valid set of headers.  So we don't expect to not have headers received