Updated structures and functions for setting the max bitrate limit to take rtc::Optional<int>

webrtc/media/base/rtpdataengine_unittest.cc

Index: webrtc/media/base/rtpdataengine_unittest.cc
diff --git a/webrtc/media/base/rtpdataengine_unittest.cc b/webrtc/media/base/rtpdataengine_unittest.cc
index 2a9b25e2774675b5e5bc5824026d917ca87fd854..5080e1cffeee7db0c28c2079c67646589fe53bfb 100644
--- a/webrtc/media/base/rtpdataengine_unittest.cc
+++ b/webrtc/media/base/rtpdataengine_unittest.cc
@@ -378,7 +378,7 @@ TEST_F(RtpDataMediaChannelTest, SendDataRate) {
   // With rtp overhead of 32 bytes, each one of our packets is 36
   // bytes, or 288 bits.  So, a limit of 872bps will allow 3 packets,
   // but not four.
-  parameters.max_bandwidth_bps = 872;
+  parameters.max_bitrate_bps = rtc::Optional<int>(872);
   ASSERT_TRUE(dmc->SetSendParameters(parameters));
 
   EXPECT_TRUE(dmc->SendData(params, payload, &result));