Pass implementation object to supplemental classes by reference

Source/core/page/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 3039 matching lines @@
     return (keyCode >= VK_BACK && keyCode <= VK_CAPITAL)
         || (keyCode >= VK_SPACE && keyCode <= VK_DELETE)
         || (keyCode >= VK_OEM_1 && keyCode <= VK_OEM_PLUS)
         || (keyCode >= VK_MULTIPLY && keyCode <= VK_OEM_8);
 }
 
 bool EventHandler::keyEvent(const PlatformKeyboardEvent& initialKeyEvent)
 {
     RefPtr<FrameView> protector(m_frame->view());
 
-    if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(m_frame->document())) {
+    ASSERT(m_frame->document());
+    if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(*m_frame->document())) {
         if (fullscreen->webkitIsFullScreen() && !isKeyEventAllowedInFullScreen(fullscreen, initialKeyEvent))
             return false;
     }
 
     if (initialKeyEvent.windowsVirtualKeyCode() == VK_CAPITAL)
         capsLockStateMayHaveChanged();
 
 #if OS(WIN)
     if (panScrollInProgress()) {
         // If a key is pressed while the panScroll is in progress then we want to stop
@@ skipping 937 matching lines @@
 unsigned EventHandler::accessKeyModifiers()
 {
 #if OS(MACOSX)
     return PlatformEvent::CtrlKey | PlatformEvent::AltKey;
 #else
     return PlatformEvent::AltKey;
 #endif
 }
 
 } // namespace WebCore