Standardize usage of virtual/override/final in ui/

ui/base/accelerators/platform_accelerator_cocoa.h

Index: ui/base/accelerators/platform_accelerator_cocoa.h
diff --git a/ui/base/accelerators/platform_accelerator_cocoa.h b/ui/base/accelerators/platform_accelerator_cocoa.h
index f14bc4dfb72ca5320e4f8db575c13622f3355acb..c6fed1d73b331429a7578c294ab3b35fbb2407c1 100644
--- a/ui/base/accelerators/platform_accelerator_cocoa.h
+++ b/ui/base/accelerators/platform_accelerator_cocoa.h
@@ -17,11 +17,11 @@ class UI_BASE_EXPORT PlatformAcceleratorCocoa : public PlatformAccelerator {
  public:
   PlatformAcceleratorCocoa();
   PlatformAcceleratorCocoa(NSString* key_code, NSUInteger modifier_mask);
-  virtual ~PlatformAcceleratorCocoa();
+  ~PlatformAcceleratorCocoa() override;
 
   // PlatformAccelerator:
-  virtual scoped_ptr<PlatformAccelerator> CreateCopy() const override;
-  virtual bool Equals(const PlatformAccelerator& rhs) const override;
+  scoped_ptr<PlatformAccelerator> CreateCopy() const override;
+  bool Equals(const PlatformAccelerator& rhs) const override;
 
   // The keyEquivalent of the NSMenuItem associated with the accelerator.
   NSString* characters() const { return characters_.get(); }