Created the DtlsSrtpTransport.

pc/srtptransport_unittest.cc

Index: pc/srtptransport_unittest.cc
diff --git a/pc/srtptransport_unittest.cc b/pc/srtptransport_unittest.cc
index d3bc259a0535e051b98337df0e35a2d563ac7291..028b68eb0f69013a19fdeb75e16c5de193ddd682 100644
--- a/pc/srtptransport_unittest.cc
+++ b/pc/srtptransport_unittest.cc
@@ -310,14 +310,10 @@ class SrtpTransportTest : public testing::Test, public sigslot::has_slots<> {
     encrypted_headers.push_back(4);
     EXPECT_EQ(key1_len, key2_len);
     EXPECT_EQ(cs_name, rtc::SrtpCryptoSuiteToName(cs));
-    srtp_transport1_->SetEncryptedHeaderExtensionIds(cricket::CS_LOCAL,
-                                                     encrypted_headers);
-    srtp_transport1_->SetEncryptedHeaderExtensionIds(cricket::CS_REMOTE,
-                                                     encrypted_headers);
-    srtp_transport2_->SetEncryptedHeaderExtensionIds(cricket::CS_LOCAL,
-                                                     encrypted_headers);
-    srtp_transport2_->SetEncryptedHeaderExtensionIds(cricket::CS_REMOTE,
-                                                     encrypted_headers);
+    srtp_transport1_->SetRecvEncryptedHeaderExtensionIds(encrypted_headers);
+    srtp_transport1_->SetSendEncryptedHeaderExtensionIds(encrypted_headers);
+    srtp_transport2_->SetRecvEncryptedHeaderExtensionIds(encrypted_headers);
+    srtp_transport2_->SetSendEncryptedHeaderExtensionIds(encrypted_headers);
     EXPECT_TRUE(
         srtp_transport1_->SetRtpParams(cs, key1, key1_len, cs, key2, key2_len));
     EXPECT_TRUE(