QUIC loadtest fixes:

net/tools/quic/quic_client.cc

Index: net/tools/quic/quic_client.cc
diff --git a/net/tools/quic/quic_client.cc b/net/tools/quic/quic_client.cc
index f1234d088c64f8a77d10df6df7d346dba22f2ac0..135a8fc797dc16fabaf0db8480ecdc22036da453 100644
--- a/net/tools/quic/quic_client.cc
+++ b/net/tools/quic/quic_client.cc
@@ -237,7 +237,7 @@ QuicSpdyClientStream* QuicClient::CreateReliableClientStream() {
 void QuicClient::WaitForStreamToClose(QuicStreamId id) {
   DCHECK(connected());
 
-  while (!session_->IsClosedStream(id)) {
+  while (connected() && !session_->IsClosedStream(id)) {
     epoll_server_.WaitForEventsAndExecuteCallbacks();
   }
 }
@@ -245,7 +245,7 @@ void QuicClient::WaitForStreamToClose(QuicStreamId id) {
 void QuicClient::WaitForCryptoHandshakeConfirmed() {
   DCHECK(connected());
 
-  while (!session_->IsCryptoHandshakeConfirmed()) {
+  while (connected() && !session_->IsCryptoHandshakeConfirmed()) {
     epoll_server_.WaitForEventsAndExecuteCallbacks();
   }
 }