Reland of move RTPPayloadStrategy and simplify RTPPayloadRegistry

webrtc/modules/rtp_rtcp/test/testAPI/test_api_video.cc

 /*
  *  Copyright (c) 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 17 matching lines @@
 
 const unsigned char kPayloadType = 100;
 
 };
 
 namespace webrtc {
 
 class RtpRtcpVideoTest : public ::testing::Test {
  protected:
   RtpRtcpVideoTest()
-      : rtp_payload_registry_(RTPPayloadStrategy::CreateStrategy(false)),
-        test_ssrc_(3456),
+      : test_ssrc_(3456),
         test_timestamp_(4567),
         test_sequence_number_(2345),
         fake_clock(123456),
         retransmission_rate_limiter_(&fake_clock, 1000) {}
   ~RtpRtcpVideoTest() {}
 
   virtual void SetUp() {
     transport_ = new LoopBackTransport();
     receiver_ = new TestRtpReceiver();
     receive_statistics_.reset(ReceiveStatistics::Create(&fake_clock));
@@ skipping 126 matching lines @@
                                                    payload_specific, true));
       EXPECT_EQ(0u, receiver_->payload_size());
       EXPECT_EQ(payload_length, receiver_->rtp_header().header.paddingLength);
     }
     timestamp += 3000;
     fake_clock.AdvanceTimeMilliseconds(33);
   }
 }
 
 }  // namespace webrtc