Enable -Winconsistent-missing-override flag.

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

Index: webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
diff --git a/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc b/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
index 2ebd1927bc4de2197656ca4e6fac33a6d843aeea..62bfc1b3cb53d1b754a03b4ccbb660412312c87b 100644
--- a/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
+++ b/webrtc/modules/audio_coding/neteq/test/neteq_isac_quality_test.cc
@@ -43,8 +43,8 @@ class NetEqIsacQualityTest : public NetEqQualityTest {
   NetEqIsacQualityTest();
   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:
   ISACFIX_MainStruct* isac_encoder_;
   int bit_rate_kbps_;