Removed |which| from KeyboardEvent and MouseEvent.

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

 /**
  * 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, 2005, 2006, 2007 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
  * version 2 of the License, or (at your option) any later version.
@@ skipping 169 matching lines @@
 }
 
 const AtomicString& KeyboardEvent::InterfaceName() const {
   return EventNames::KeyboardEvent;
 }
 
 bool KeyboardEvent::IsKeyboardEvent() const {
   return true;
 }
 
-int KeyboardEvent::which() const {
+unsigned KeyboardEvent::which() const {
   // Netscape's "which" returns a virtual key code for keydown and keyup, and a
   // character code for keypress.  That's exactly what IE's "keyCode" returns.
   // So they are the same for keyboard events.
-  return keyCode();
+  return (unsigned)keyCode();
 }
 
 void KeyboardEvent::InitLocationModifiers(unsigned location) {
   switch (location) {
     case KeyboardEvent::kDomKeyLocationNumpad:
       modifiers_ |= WebInputEvent::kIsKeyPad;
       break;
     case KeyboardEvent::kDomKeyLocationLeft:
       modifiers_ |= WebInputEvent::kIsLeft;
       break;
     case KeyboardEvent::kDomKeyLocationRight:
       modifiers_ |= WebInputEvent::kIsRight;
       break;
   }
 }
 
 DEFINE_TRACE(KeyboardEvent) {
   UIEventWithKeyState::Trace(visitor);
 }
 
 }  // namespace blink