Enable -Winconsistent-missing-override flag.

webrtc/modules/audio_coding/neteq/test/neteq_opus_quality_test.cc

Index: webrtc/modules/audio_coding/neteq/test/neteq_opus_quality_test.cc
diff --git a/webrtc/modules/audio_coding/neteq/test/neteq_opus_quality_test.cc b/webrtc/modules/audio_coding/neteq/test/neteq_opus_quality_test.cc
index baa0d67aded47da5080feca0891d32bebf5a3bfe..a6117a4c5b66155509cd72cb3433c8303f4a5951 100644
--- a/webrtc/modules/audio_coding/neteq/test/neteq_opus_quality_test.cc
+++ b/webrtc/modules/audio_coding/neteq/test/neteq_opus_quality_test.cc
@@ -103,8 +103,8 @@ class NetEqOpusQualityTest : public NetEqQualityTest {
   NetEqOpusQualityTest();
   void SetUp() override;
   void TearDown() override;
-  virtual int EncodeBlock(int16_t* in_data, size_t block_size_samples,
-                          rtc::Buffer* payload, size_t max_bytes);
+  int EncodeBlock(int16_t* in_data, size_t block_size_samples,
+                  rtc::Buffer* payload, size_t max_bytes) override;
  private:
   WebRtcOpusEncInst* opus_encoder_;
   OpusRepacketizer* repacketizer_;