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

Source/core/html/SearchInputType.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 77 matching lines @@
 }
 
 void SearchInputType::createShadowSubtree()
 {
     TextFieldInputType::createShadowSubtree();
     HTMLElement* container = containerElement();
     HTMLElement* textWrapper = innerBlockElement();
     ASSERT(container);
     ASSERT(textWrapper);
 
-    container->insertBefore(SearchFieldDecorationElement::create(element()->document()), textWrapper);
-    container->insertBefore(SearchFieldCancelButtonElement::create(element()->document()), textWrapper->nextSibling());
+    container->insertBefore(SearchFieldDecorationElement::create(&element()->document()), textWrapper);
+    container->insertBefore(SearchFieldCancelButtonElement::create(&element()->document()), textWrapper->nextSibling());
 }
 
 void SearchInputType::handleKeydownEvent(KeyboardEvent* event)
 {
     if (element()->isDisabledOrReadOnly()) {
         TextFieldInputType::handleKeydownEvent(event);
         return;
     }
 
     const String& key = event->keyIdentifier();
@@ skipping 65 matching lines @@
     else
         button->removeInlineStyleProperty(CSSPropertyVisibility);
 }
 
 bool SearchInputType::supportsInputModeAttribute() const
 {
     return true;
 }
 
 } // namespace WebCore