Standardize usage of virtual/override/final specifiers.

remoting/host/input_injector_linux.cc

Index: remoting/host/input_injector_linux.cc
diff --git a/remoting/host/input_injector_linux.cc b/remoting/host/input_injector_linux.cc
index 81eda6553dca3c076c91fa64b9675f5fea74bb58..523c71dab4e44aeea1d3fc807254f769215c5e7d 100644
--- a/remoting/host/input_injector_linux.cc
+++ b/remoting/host/input_injector_linux.cc
@@ -92,21 +92,20 @@ class InputInjectorLinux : public InputInjector {
  public:
   explicit InputInjectorLinux(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
-  virtual ~InputInjectorLinux();
+  ~InputInjectorLinux() override;
 
   bool Init();
 
   // Clipboard stub interface.
-  virtual void InjectClipboardEvent(const ClipboardEvent& event) override;
+  void InjectClipboardEvent(const ClipboardEvent& event) override;
 
   // InputStub interface.
-  virtual void InjectKeyEvent(const KeyEvent& event) override;
-  virtual void InjectTextEvent(const TextEvent& event) override;
-  virtual void InjectMouseEvent(const MouseEvent& event) override;
+  void InjectKeyEvent(const KeyEvent& event) override;
+  void InjectTextEvent(const TextEvent& event) override;
+  void InjectMouseEvent(const MouseEvent& event) override;
 
   // InputInjector interface.
-  virtual void Start(
-      scoped_ptr<protocol::ClipboardStub> client_clipboard) override;
+  void Start(scoped_ptr<protocol::ClipboardStub> client_clipboard) override;
 
  private:
   // The actual implementation resides in InputInjectorLinux::Core class.