Propogate network-worker thread split to api

webrtc/api/peerconnectioninterface_unittest.cc

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 508 matching lines @@
 class PeerConnectionInterfaceTest : public testing::Test {
  protected:
   PeerConnectionInterfaceTest() {
 #ifdef WEBRTC_ANDROID
     webrtc::InitializeAndroidObjects();
 #endif
   }
 
   virtual void SetUp() {
     pc_factory_ = webrtc::CreatePeerConnectionFactory(
-        rtc::Thread::Current(), rtc::Thread::Current(), NULL, NULL,
-        NULL);
-    ASSERT_TRUE(pc_factory_.get() != NULL);
+        rtc::Thread::Current(), rtc::Thread::Current(), rtc::Thread::Current(),
+        nullptr, nullptr, nullptr);
+    ASSERT_TRUE(pc_factory_);
   }
 
   void CreatePeerConnection() {
     CreatePeerConnection("", "", NULL);
   }
 
   void CreatePeerConnection(webrtc::MediaConstraintsInterface* constraints) {
     CreatePeerConnection("", "", constraints);
   }
 
@@ skipping 2168 matching lines @@
   FakeConstraints updated_answer_c;
   answer_c.SetMandatoryReceiveAudio(false);
   answer_c.SetMandatoryReceiveVideo(false);
 
   cricket::MediaSessionOptions updated_answer_options;
   EXPECT_TRUE(
       ParseConstraintsForAnswer(&updated_answer_c, &updated_answer_options));
   EXPECT_TRUE(updated_answer_options.has_audio());
   EXPECT_TRUE(updated_answer_options.has_video());
 }