Revert of Enable -Winconsistent-missing-override flag.

webrtc/base/rtccertificategenerator_unittest.cc

 /*
  *  Copyright 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 18 matching lines @@
     RTC_CHECK(signaling_thread_);
     RTC_CHECK(worker_thread_->Start());
     generator_.reset(
       new RTCCertificateGenerator(signaling_thread_, worker_thread_.get()));
   }
   ~RTCCertificateGeneratorFixture() override {}
 
   RTCCertificateGenerator* generator() const { return generator_.get(); }
   RTCCertificate* certificate() const { return certificate_.get(); }
 
-  void OnSuccess(const scoped_refptr<RTCCertificate>& certificate) override {
+  void OnSuccess(const scoped_refptr<RTCCertificate>& certificate) {
     RTC_CHECK(signaling_thread_->IsCurrent());
     RTC_CHECK(certificate);
     certificate_ = certificate;
     generate_async_completed_ = true;
   }
-  void OnFailure() override {
+  void OnFailure() {
     RTC_CHECK(signaling_thread_->IsCurrent());
     certificate_ = nullptr;
     generate_async_completed_ = true;
   }
 
   bool GenerateAsyncCompleted() {
     RTC_CHECK(signaling_thread_->IsCurrent());
     if (generate_async_completed_) {
       // Reset flag so that future generation requests are not considered done.
       generate_async_completed_ = false;
@@ skipping 87 matching lines @@
 
   fixture_->generator()->GenerateCertificateAsync(
       invalid_params,
       Optional<uint64_t>(),
       fixture_);
   EXPECT_TRUE_WAIT(fixture_->GenerateAsyncCompleted(), kGenerationTimeoutMs);
   EXPECT_FALSE(fixture_->certificate());
 }
 
 }  // namespace rtc