Standardize usage of virtual/override/final in remoting/

remoting/host/desktop_session_agent.cc

Index: remoting/host/desktop_session_agent.cc
diff --git a/remoting/host/desktop_session_agent.cc b/remoting/host/desktop_session_agent.cc
index d4b15a0cd4e1c4648f7705d10b662257f5f153ca..6ba38e3826764a9bb041d7a375706abda5b26eff 100644
--- a/remoting/host/desktop_session_agent.cc
+++ b/remoting/host/desktop_session_agent.cc
@@ -39,11 +39,10 @@ class DesktopSesssionClipboardStub : public protocol::ClipboardStub {
  public:
   explicit DesktopSesssionClipboardStub(
       scoped_refptr<DesktopSessionAgent> desktop_session_agent);
-  virtual ~DesktopSesssionClipboardStub();
+  ~DesktopSesssionClipboardStub() override;
 
   // protocol::ClipboardStub implementation.
-  virtual void InjectClipboardEvent(
-      const protocol::ClipboardEvent& event) override;
+  void InjectClipboardEvent(const protocol::ClipboardEvent& event) override;
 
  private:
   scoped_refptr<DesktopSessionAgent> desktop_session_agent_;
@@ -79,9 +78,7 @@ class DesktopSessionAgent::SharedBuffer : public webrtc::SharedMemory {
     return make_scoped_ptr(new SharedBuffer(agent, memory.Pass(), size, id));
   }
 
-  virtual ~SharedBuffer() {
-    agent_->OnSharedBufferDeleted(id());
-  }
+  ~SharedBuffer() override { agent_->OnSharedBufferDeleted(id()); }
 
  private:
   SharedBuffer(DesktopSessionAgent* agent,