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 3c40a1a95e31a5b08c23db7402975a5d43f25575..e65dc45e60d6008b1bfcd36a659f4d2c348a8d47 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();
+}
+
 int 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