Removed |which| from KeyboardEvent and MouseEvent.

third_party/WebKit/Source/core/events/KeyboardEvent.h

 /*
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights
  * reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 66 matching lines @@
 
   const WebKeyboardEvent* KeyEvent() const { return key_event_.get(); }
 
   int keyCode()
       const;  // key code for keydown and keyup, character for keypress
   int charCode() const;  // character code for keypress, 0 for keydown and keyup
   bool repeat() const { return GetModifiers() & WebInputEvent::kIsAutoRepeat; }
 
   const AtomicString& InterfaceName() const override;
   bool IsKeyboardEvent() const override;
-  int which() const override;
+  unsigned which() const override;
   bool isComposing() const { return is_composing_; }
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   KeyboardEvent();
   KeyboardEvent(const WebKeyboardEvent&, LocalDOMWindow*);
 
   void InitLocationModifiers(unsigned location);
 
   std::unique_ptr<WebKeyboardEvent> key_event_;
   String code_;
   String key_;
   unsigned location_;
   bool is_composing_;
 };
 
 DEFINE_EVENT_TYPE_CASTS(KeyboardEvent);
 
 }  // namespace blink
 
 #endif  // KeyboardEvent_h