Standardize usage of virtual/override/final in remoting/

This patch was automatically generated by applying clang fixit hints
generated by the plugin to the source tree.

BUG=417463
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Review URL: https://codereview.chromium.org/667123002

Cr-Commit-Position: refs/heads/master@{#300472}
diff --git a/remoting/protocol/third_party_client_authenticator.h b/remoting/protocol/third_party_client_authenticator.h
index ac0bd95..53dcde8 100644
--- a/remoting/protocol/third_party_client_authenticator.h
+++ b/remoting/protocol/third_party_client_authenticator.h
@@ -58,14 +58,13 @@
   // |host_public_key|. |token_fetcher| is used to get the authentication token.
   explicit ThirdPartyClientAuthenticator(
       scoped_ptr<TokenFetcher> token_fetcher);
-  virtual ~ThirdPartyClientAuthenticator();
+  ~ThirdPartyClientAuthenticator() override;
 
  protected:
   // ThirdPartyAuthenticator implementation.
-  virtual void ProcessTokenMessage(
-      const buzz::XmlElement* message,
-      const base::Closure& resume_callback) override;
-  virtual void AddTokenElements(buzz::XmlElement* message) override;
+  void ProcessTokenMessage(const buzz::XmlElement* message,
+                           const base::Closure& resume_callback) override;
+  void AddTokenElements(buzz::XmlElement* message) override;
 
  private:
   void OnThirdPartyTokenFetched(const base::Closure& resume_callback,