Makes QuicChromiumPacketWriter use the delegate for interacting with the connection.

net/quic/chromium/quic_chromium_client_session.cc

Index: net/quic/chromium/quic_chromium_client_session.cc
diff --git a/net/quic/chromium/quic_chromium_client_session.cc b/net/quic/chromium/quic_chromium_client_session.cc
index 5a1ae051a4ae2a91d815c357d422adbd7ad33f35..258b0c6b4eac7cfb2498a95f5b29fc00dbc2a388 100644
--- a/net/quic/chromium/quic_chromium_client_session.cc
+++ b/net/quic/chromium/quic_chromium_client_session.cc
@@ -948,7 +948,7 @@ void QuicChromiumClientSession::OnSuccessfulVersionNegotiation(
   QuicSpdySession::OnSuccessfulVersionNegotiation(version);
 }
 
-int QuicChromiumClientSession::OnWriteError(
+int QuicChromiumClientSession::HandleWriteError(
     int error_code,
     scoped_refptr<StringIOBuffer> packet) {
   DCHECK(packet != nullptr);
@@ -959,6 +959,16 @@ int QuicChromiumClientSession::OnWriteError(
   return use_error_code_from_rewrite_ ? error_code_from_rewrite_ : error_code;
 }
 
+void QuicChromiumClientSession::OnWriteError(int error_code) {
+  DCHECK_NE(ERR_IO_PENDING, error_code);
+  DCHECK_GT(0, error_code);
+  connection()->OnWriteError(error_code);
+}
+
+void QuicChromiumClientSession::OnWriteUnblocked() {
+  connection()->OnCanWrite();
+}
+
 void QuicChromiumClientSession::OnPathDegrading() {
   if (stream_factory_) {
     stream_factory_->MaybeMigrateSingleSession(this, EARLY_MIGRATION, nullptr);