Added NiceMock for MockRtcEventLog in several unittests where we don't care about the event logging.

webrtc/modules/congestion_controller/congestion_controller_unittest.cc

 /*
  *  Copyright (c) 2016 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 34 matching lines @@
     // to be updated.
     EXPECT_CALL(observer_, OnNetworkChanged(kInitialBitrateBps, _, _));
     EXPECT_CALL(*pacer_, SetEstimatedBitrate(kInitialBitrateBps));
     controller_->SetBweBitrates(0, kInitialBitrateBps, 5 * kInitialBitrateBps);
   }
 
   SimulatedClock clock_;
   StrictMock<MockCongestionObserver> observer_;
   NiceMock<MockPacedSender>* pacer_;
   NiceMock<MockRemoteBitrateObserver> remote_bitrate_observer_;
-  MockRtcEventLog event_log_;
+  NiceMock<MockRtcEventLog> event_log_;
   std::unique_ptr<RtcpBandwidthObserver> bandwidth_observer_;
   std::unique_ptr<CongestionController> controller_;
   const uint32_t kInitialBitrateBps = 60000;
 };
 
 TEST_F(CongestionControllerTest, OnNetworkChanged) {
   // Test no change.
   clock_.AdvanceTimeMilliseconds(25);
   controller_->Process();
 
@@ skipping 98 matching lines @@
 
   // Let the pacer not be full next time the controller checks.
   EXPECT_CALL(*pacer_, ExpectedQueueTimeMs())
       .WillOnce(Return(PacedSender::kMaxQueueLengthMs - 1));
   EXPECT_CALL(observer_, OnNetworkChanged(kInitialBitrateBps * 2, _, _));
   controller_->Process();
 }
 
 }  // namespace test
 }  // namespace webrtc