virtual/override specifier cleanup in ui/ (mostly Ozone code).

ui/events/ozone/layout/stub/stub_keyboard_layout_engine.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_EVENTS_OZONE_LAYOUT_STUB_STUB_KEYBOARD_LAYOUT_ENGINE_H_
 #define UI_EVENTS_OZONE_LAYOUT_STUB_STUB_KEYBOARD_LAYOUT_ENGINE_H_
 
 #include "ui/events/ozone/layout/events_ozone_layout_export.h"
 #include "ui/events/ozone/layout/keyboard_layout_engine.h"
 
 namespace ui {
 
 class EVENTS_OZONE_LAYOUT_EXPORT StubKeyboardLayoutEngine
     : public KeyboardLayoutEngine {
  public:
   StubKeyboardLayoutEngine();
-  virtual ~StubKeyboardLayoutEngine();
+  ~StubKeyboardLayoutEngine() override;
 
   // KeyboardLayoutEngineOzone:
-  virtual bool CanSetCurrentLayout() const override;
-  virtual bool SetCurrentLayoutByName(const std::string& layout_name) override;
-  virtual bool UsesISOLevel5Shift() const override;
-  virtual bool UsesAltGr() const override;
-  virtual bool Lookup(DomCode dom_code,
-                      int flags,
-                      DomKey* dom_key,
-                      base::char16* character,
-                      KeyboardCode* key_code,
-                      uint32* platform_keycode) const override;
+  bool CanSetCurrentLayout() const override;
+  bool SetCurrentLayoutByName(const std::string& layout_name) override;
+  bool UsesISOLevel5Shift() const override;
+  bool UsesAltGr() const override;
+  bool Lookup(DomCode dom_code,
+              int flags,
+              DomKey* dom_key,
+              base::char16* character,
+              KeyboardCode* key_code,
+              uint32* platform_keycode) const override;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_OZONE_LAYOUT_STUB_STUB_KEYBOARD_LAYOUT_ENGINE_H_