Adds dynamic FEC on/off switch in packet creator. Tightens use of

net/quic/quic_packet_generator_test.cc

Index: net/quic/quic_packet_generator_test.cc
diff --git a/net/quic/quic_packet_generator_test.cc b/net/quic/quic_packet_generator_test.cc
index 8bb1dfdff631c3617fad78bad12a19a0e8b7b82a..16f974829f8a3a411c212f60a0f61ee048b58687 100644
--- a/net/quic/quic_packet_generator_test.cc
+++ b/net/quic/quic_packet_generator_test.cc
@@ -11,6 +11,7 @@
 #include "net/quic/crypto/quic_decrypter.h"
 #include "net/quic/crypto/quic_encrypter.h"
 #include "net/quic/quic_utils.h"
+#include "net/quic/test_tools/quic_packet_creator_peer.h"
 #include "net/quic/test_tools/quic_test_utils.h"
 #include "net/quic/test_tools/simple_quic_framer.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ -439,7 +440,7 @@ TEST_F(QuicPacketGeneratorTest, ConsumeDataFEC) {
   delegate_.SetCanWriteAnything();
 
   // Send FEC every two packets.
-  creator_.options()->max_packets_per_fec_group = 2;
+  EXPECT_TRUE(QuicPacketCreatorPeer::SwitchFecProtectionOn(&creator_, 2));
 
   {
     InSequence dummy;
@@ -475,8 +476,7 @@ TEST_F(QuicPacketGeneratorTest, ConsumeDataSendsFecAtEnd) {
   delegate_.SetCanWriteAnything();
 
   // Send FEC every six packets.
-  creator_.options()->max_packets_per_fec_group = 6;
-
+  EXPECT_TRUE(QuicPacketCreatorPeer::SwitchFecProtectionOn(&creator_, 6));
   {
     InSequence dummy;
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(