Have Range constructor take a Document reference in argument

Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 131 matching lines @@
 {
     return adoptPtr(new DragController(page, client));
 }
 
 static PassRefPtr<DocumentFragment> documentFragmentFromDragData(DragData* dragData, Frame* frame, RefPtr<Range> context,
                                           bool allowPlainText, bool& chosePlainText)
 {
     ASSERT(dragData);
     chosePlainText = false;
 
-    Document* document = context->ownerDocument();
-    ASSERT(document);
-    if (document && dragData->containsCompatibleContent()) {
+    Document& document = context->ownerDocument();
+    if (dragData->containsCompatibleContent()) {
         if (PassRefPtr<DocumentFragment> fragment = dragData->asFragment(frame, context, allowPlainText, chosePlainText))
             return fragment;
 
         if (dragData->containsURL(frame, DragData::DoNotConvertFilenames)) {
             String title;
             String url = dragData->asURL(frame, DragData::DoNotConvertFilenames, &title);
             if (!url.isEmpty()) {
-                RefPtr<HTMLAnchorElement> anchor = HTMLAnchorElement::create(*document);
+                RefPtr<HTMLAnchorElement> anchor = HTMLAnchorElement::create(document);
                 anchor->setHref(url);
                 if (title.isEmpty()) {
                     // Try the plain text first because the url might be normalized or escaped.
                     if (dragData->containsPlainText())
                         title = dragData->asPlainText(frame);
                     if (title.isEmpty())
                         title = url;
                 }
-                RefPtr<Node> anchorText = document->createTextNode(title);
+                RefPtr<Node> anchorText = document.createTextNode(title);
                 anchor->appendChild(anchorText);
-                RefPtr<DocumentFragment> fragment = document->createDocumentFragment();
+                RefPtr<DocumentFragment> fragment = document.createDocumentFragment();
                 fragment->appendChild(anchor);
                 return fragment.release();
             }
         }
     }
     if (allowPlainText && dragData->containsPlainText()) {
         chosePlainText = true;
         return createFragmentFromText(context.get(), dragData->asPlainText(frame)).get();
     }
 
@@ skipping 294 matching lines @@
 
     VisibleSelection dragCaret = m_page->dragCaretController().caretPosition();
     m_page->dragCaretController().clear();
     RefPtr<Range> range = dragCaret.toNormalizedRange();
     RefPtr<Element> rootEditableElement = innerFrame->selection().rootEditableElement();
 
     // For range to be null a WebKit client must have done something bad while
     // manually controlling drag behaviour
     if (!range)
         return false;
-    ResourceFetcher* fetcher = range->ownerDocument()->fetcher();
+    ResourceFetcher* fetcher = range->ownerDocument().fetcher();
     ResourceCacheValidationSuppressor validationSuppressor(fetcher);
     if (dragIsMove(innerFrame->selection(), dragData) || dragCaret.isContentRichlyEditable()) {
         bool chosePlainText = false;
         RefPtr<DocumentFragment> fragment = documentFragmentFromDragData(dragData, innerFrame.get(), range, true, chosePlainText);
         if (!fragment || !innerFrame->editor().shouldInsertFragment(fragment, range, EditorInsertActionDropped)) {
             return false;
         }
 
         if (dragIsMove(innerFrame->selection(), dragData)) {
             // NSTextView behavior is to always smart delete on moving a selection,
@@ skipping 424 matching lines @@
     return false;
 #endif
 }
 
 void DragController::cleanupAfterSystemDrag()
 {
 }
 
 } // namespace WebCore