Standardize usage of virtual/override/final in remoting/

remoting/protocol/clipboard_filter.h

Index: remoting/protocol/clipboard_filter.h
diff --git a/remoting/protocol/clipboard_filter.h b/remoting/protocol/clipboard_filter.h
index 19a8d2508949eaa087edd01299770ce630a1f683..545744790da69803504ac2c74f818190f98ab1ad 100644
--- a/remoting/protocol/clipboard_filter.h
+++ b/remoting/protocol/clipboard_filter.h
@@ -19,7 +19,7 @@ class ClipboardFilter : public ClipboardStub {
  public:
   ClipboardFilter();
   explicit ClipboardFilter(ClipboardStub* clipboard_stub);
-  virtual ~ClipboardFilter();
+  ~ClipboardFilter() override;
 
   // Set the ClipboardStub that events will be forwarded to.
   void set_clipboard_stub(ClipboardStub* clipboard_stub);
@@ -29,7 +29,7 @@ class ClipboardFilter : public ClipboardStub {
   bool enabled() const { return enabled_; }
 
   // ClipboardStub interface.
-  virtual void InjectClipboardEvent(const ClipboardEvent& event) override;
+  void InjectClipboardEvent(const ClipboardEvent& event) override;
 
  private:
   ClipboardStub* clipboard_stub_;