[Cronet] Make delaying sending request headers explicit in bidirectional stream

components/cronet/ios/cronet_bidirectional_stream.cc

Index: components/cronet/ios/cronet_bidirectional_stream.cc
diff --git a/components/cronet/ios/cronet_bidirectional_stream.cc b/components/cronet/ios/cronet_bidirectional_stream.cc
index c5e091d5c7d2d9f40570ea166dc703b1d43beacd..6398c99b4bb1e76672bf9f4c37d08d314046ac75 100644
--- a/components/cronet/ios/cronet_bidirectional_stream.cc
+++ b/components/cronet/ios/cronet_bidirectional_stream.cc
@@ -113,7 +113,7 @@ void CronetBidirectionalStream::Destroy() {
                             base::Unretained(this)));
 }
 
-void CronetBidirectionalStream::OnStreamReady() {
+void CronetBidirectionalStream::OnStreamReady(bool /*request_headers_sent*/) {
   DCHECK(environment_->IsOnNetworkThread());
   DCHECK(write_state_ == STARTED);
   write_state_ = WAITING_FOR_WRITE;