Properly handle different transports having different SSL roles.

webrtc/p2p/base/transportcontroller_unittest.cc

Index: webrtc/p2p/base/transportcontroller_unittest.cc
diff --git a/webrtc/p2p/base/transportcontroller_unittest.cc b/webrtc/p2p/base/transportcontroller_unittest.cc
index 23e4dc80671d2e873f9e213afda28175e2113ce4..b28ac248f86cdf4fb181189108f542efc3964967 100644
--- a/webrtc/p2p/base/transportcontroller_unittest.cc
+++ b/webrtc/p2p/base/transportcontroller_unittest.cc
@@ -262,7 +262,8 @@ TEST_F(TransportControllerTest, TestGetSslRole) {
   ASSERT_NE(nullptr, channel);
   ASSERT_TRUE(channel->SetSslRole(rtc::SSL_CLIENT));
   rtc::SSLRole role;
-  EXPECT_TRUE(transport_controller_->GetSslRole(&role));
+  EXPECT_FALSE(transport_controller_->GetSslRole("video", &role));
+  EXPECT_TRUE(transport_controller_->GetSslRole("audio", &role));
   EXPECT_EQ(rtc::SSL_CLIENT, role);
 }