Revert of Enable -Winconsistent-missing-override flag.

webrtc/base/fakesslidentity.h

Index: webrtc/base/fakesslidentity.h
diff --git a/webrtc/base/fakesslidentity.h b/webrtc/base/fakesslidentity.h
index 3b0df2984120a7d501b04ac5698fd43d1d8323bb..9f98c4e5509c2b880940d8de56da3c177f661b0e 100644
--- a/webrtc/base/fakesslidentity.h
+++ b/webrtc/base/fakesslidentity.h
@@ -37,13 +37,13 @@
       certs_.push_back(FakeSSLCertificate(*it));
     }
   }
-  FakeSSLCertificate* GetReference() const override {
+  virtual FakeSSLCertificate* GetReference() const {
     return new FakeSSLCertificate(*this);
   }
-  std::string ToPEMString() const override {
+  virtual std::string ToPEMString() const {
     return data_;
   }
-  void ToDER(Buffer* der_buffer) const override {
+  virtual void ToDER(Buffer* der_buffer) const {
     std::string der_string;
     VERIFY(SSLIdentity::PemToDer(kPemTypeCertificate, data_, &der_string));
     der_buffer->SetData(der_string.c_str(), der_string.size());
@@ -57,19 +57,19 @@
   void set_digest_algorithm(const std::string& algorithm) {
     digest_algorithm_ = algorithm;
   }
-  bool GetSignatureDigestAlgorithm(std::string* algorithm) const override {
+  virtual bool GetSignatureDigestAlgorithm(std::string* algorithm) const {
     *algorithm = digest_algorithm_;
     return true;
   }
-  bool ComputeDigest(const std::string& algorithm,
-                     unsigned char* digest,
-                     size_t size,
-                     size_t* length) const override {
+  virtual bool ComputeDigest(const std::string& algorithm,
+                             unsigned char* digest,
+                             size_t size,
+                             size_t* length) const {
     *length = rtc::ComputeDigest(algorithm, data_.c_str(), data_.size(),
                                        digest, size);
     return (*length != 0);
   }
-  std::unique_ptr<SSLCertChain> GetChain() const override {
+  virtual std::unique_ptr<SSLCertChain> GetChain() const {
     if (certs_.empty())
       return nullptr;
     std::vector<SSLCertificate*> new_certs(certs_.size());