Have Node::document() return a reference instead of a pointer

Source/core/html/InputType.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2009, 2010, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
@@ skipping 378 matching lines @@
         return;
 
     root->removeChildren();
 
     // It's ok to clear contents of all other ShadowRoots because they must have
     // been created by InputFieldPasswordGeneratorButtonElement, and we don't allow adding
     // AuthorShadowRoot to HTMLInputElement.
     // FIXME: Remove the PasswordGeneratorButtonElement's shadow root and then remove this loop.
     while ((root = root->youngerShadowRoot())) {
         root->removeChildren();
-        root->appendChild(HTMLShadowElement::create(shadowTag, element()->document()));
+        root->appendChild(HTMLShadowElement::create(shadowTag, &element()->document()));
     }
 }
 
 Decimal InputType::parseToNumber(const String&, const Decimal& defaultValue) const
 {
     ASSERT_NOT_REACHED();
     return defaultValue;
 }
 
 Decimal InputType::parseToNumberOrNaN(const String& string) const
@@ skipping 15 matching lines @@
 
 void InputType::dispatchSimulatedClickIfActive(KeyboardEvent* event) const
 {
     if (element()->active())
         element()->dispatchSimulatedClick(event);
     event->setDefaultHandled();
 }
 
 Chrome* InputType::chrome() const
 {
-    if (Page* page = element()->document()->page())
+    if (Page* page = element()->document().page())
         return &page->chrome();
     return 0;
 }
 
 bool InputType::canSetStringValue() const
 {
     return true;
 }
 
 bool InputType::hasCustomFocusLogic() const
@@ skipping 374 matching lines @@
 
     if (newValue - stepRange.maximum() > acceptableErrorValue) {
         es.throwDOMException(InvalidStateError);
         return;
     }
     if (newValue > stepRange.maximum())
         newValue = stepRange.maximum();
 
     setValueAsDecimal(newValue, eventBehavior, es);
 
-    if (AXObjectCache* cache = element()->document()->existingAXObjectCache())
+    if (AXObjectCache* cache = element()->document().existingAXObjectCache())
         cache->postNotification(element(), AXObjectCache::AXValueChanged, true);
 }
 
 bool InputType::getAllowedValueStep(Decimal* step) const
 {
     StepRange stepRange(createStepRange(RejectAny));
     *step = stepRange.step();
     return stepRange.hasStep();
 }
 
@@ skipping 112 matching lines @@
         } else {
             applyStep(n, AnyIsDefaultStep, DispatchInputAndChangeEvent, IGNORE_EXCEPTION);
         }
     }
 }
 
 void InputType::observeFeatureIfVisible(UseCounter::Feature feature) const
 {
     if (RenderStyle* style = element()->renderStyle()) {
         if (style->visibility() != HIDDEN)
-            UseCounter::count(element()->document(), feature);
+            UseCounter::count(&element()->document(), feature);
     }
 }
 
 } // namespace WebCore