Standardize usage of virtual/override/final in remoting/

remoting/client/plugin/pepper_port_allocator.cc

Index: remoting/client/plugin/pepper_port_allocator.cc
diff --git a/remoting/client/plugin/pepper_port_allocator.cc b/remoting/client/plugin/pepper_port_allocator.cc
index e03d0501802ceb72ac6dae3b8e5f8359e3a704b9..a601480b14e1f86b38951b0c02d35567bb0f8550 100644
--- a/remoting/client/plugin/pepper_port_allocator.cc
+++ b/remoting/client/plugin/pepper_port_allocator.cc
@@ -37,12 +37,12 @@ class PepperPortAllocatorSession
       const std::vector<std::string>& relay_hosts,
       const std::string& relay_token,
       const pp::InstanceHandle& instance);
-  virtual ~PepperPortAllocatorSession();
+  ~PepperPortAllocatorSession() override;
 
   // cricket::HttpPortAllocatorBase overrides.
-  virtual void ConfigReady(cricket::PortConfiguration* config) override;
-  virtual void GetPortConfigurations() override;
-  virtual void SendSessionRequest(const std::string& host, int port) override;
+  void ConfigReady(cricket::PortConfiguration* config) override;
+  void GetPortConfigurations() override;
+  void SendSessionRequest(const std::string& host, int port) override;
 
  private:
   void OnUrlOpened(int32_t result);