Revert of Enable -Winconsistent-missing-override flag.

webrtc/video/overuse_frame_detector_unittest.cc

 /*
  *  Copyright (c) 2013 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 35 matching lines @@
   void OveruseDetected() { ++overuse_; }
   void NormalUsage() { ++normaluse_; }
 
   int overuse_;
   int normaluse_;
 };
 
 class OveruseFrameDetectorTest : public ::testing::Test,
                                  public CpuOveruseMetricsObserver {
  protected:
-  void SetUp() override {
+  virtual void SetUp() {
     clock_.reset(new SimulatedClock(1234));
     observer_.reset(new MockCpuOveruseObserver());
     options_.min_process_count = 0;
     ReinitializeOveruseDetector();
   }
 
   void ReinitializeOveruseDetector() {
     overuse_detector_.reset(new OveruseFrameDetector(
         clock_.get(), options_, observer_.get(), nullptr, this));
   }
@@ skipping 227 matching lines @@
     // Encode heavier part, resulting in >85% usage total.
     clock_->AdvanceTimeMilliseconds(kDelayMs - 1);
     overuse_detector_->FrameSent(timestamp);
     clock_->AdvanceTimeMilliseconds(kIntervalMs - kDelayMs);
     timestamp += kIntervalMs * 90;
     overuse_detector_->Process();
   }
 }
 
 }  // namespace webrtc