Simplify public interface of ProducerFec.

webrtc/modules/rtp_rtcp/source/producer_fec_unittest.cc

Index: webrtc/modules/rtp_rtcp/source/producer_fec_unittest.cc
diff --git a/webrtc/modules/rtp_rtcp/source/producer_fec_unittest.cc b/webrtc/modules/rtp_rtcp/source/producer_fec_unittest.cc
index b8885ef3b16d086925cc2376d4b4ec72f6a1588a..122dfb095137df61ba1ffa34db501163020359de 100644
--- a/webrtc/modules/rtp_rtcp/source/producer_fec_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/producer_fec_unittest.cc
@@ -122,12 +122,12 @@ TEST_F(ProducerFecTest, OneFrameFec) {
     last_timestamp = packet->header.header.timestamp;
     packets.push_back(std::move(packet));
   }
-  EXPECT_TRUE(producer_.FecAvailable());
+  EXPECT_GT(producer_.NumAvailableFecPackets(), 0u);
   uint16_t seq_num = packet_generator_.NextSeqNum();
   std::vector<std::unique_ptr<RedPacket>> red_packets =
       producer_.GetFecPacketsAsRed(kRedPayloadType, kFecPayloadType, seq_num,
                                    kRtpHeaderSize);
-  EXPECT_FALSE(producer_.FecAvailable());
+  EXPECT_EQ(producer_.NumAvailableFecPackets(), 0u);
   ASSERT_EQ(1u, red_packets.size());
   VerifyHeader(seq_num, last_timestamp, kRedPayloadType, kFecPayloadType,
                red_packets.front().get(), false);
@@ -159,12 +159,12 @@ TEST_F(ProducerFecTest, TwoFrameFec) {
       packets.push_back(std::move(packet));
     }
   }
-  EXPECT_TRUE(producer_.FecAvailable());
+  EXPECT_GT(producer_.NumAvailableFecPackets(), 0u);
   uint16_t seq_num = packet_generator_.NextSeqNum();
   std::vector<std::unique_ptr<RedPacket>> red_packets =
       producer_.GetFecPacketsAsRed(kRedPayloadType, kFecPayloadType, seq_num,
                                    kRtpHeaderSize);
-  EXPECT_FALSE(producer_.FecAvailable());
+  EXPECT_EQ(producer_.NumAvailableFecPackets(), 0u);
   ASSERT_EQ(1u, red_packets.size());
   VerifyHeader(seq_num, last_timestamp, kRedPayloadType, kFecPayloadType,
                red_packets.front().get(), false);