Have Range constructor take a Document reference in argument

Source/core/editing/SurroundingText.cpp

 /*
  * Copyright (C) 2012 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 34 matching lines @@
     if (visiblePosition.isNull())
         return;
 
     const unsigned halfMaxLength = maxLength / 2;
     CharacterIterator forwardIterator(makeRange(visiblePosition, endOfDocument(visiblePosition)).get(), TextIteratorStopsOnFormControls);
     if (!forwardIterator.atEnd())
         forwardIterator.advance(maxLength - halfMaxLength);
 
     Position position = visiblePosition.deepEquivalent().parentAnchoredEquivalent();
     Document* document = position.document();
+    ASSERT(document);
     RefPtr<Range> forwardRange = forwardIterator.range();
-    if (!forwardRange || !Range::create(document, position, forwardRange->startPosition())->text().length()) {
+    if (!forwardRange || !Range::create(*document, position, forwardRange->startPosition())->text().length()) {
         ASSERT(forwardRange);
         return;
     }
 
     BackwardsCharacterIterator backwardsIterator(makeRange(startOfDocument(visiblePosition), visiblePosition).get(), TextIteratorStopsOnFormControls);
     if (!backwardsIterator.atEnd())
         backwardsIterator.advance(halfMaxLength);
 
     RefPtr<Range> backwardsRange = backwardsIterator.range();
     if (!backwardsRange) {
         ASSERT(backwardsRange);
         return;
     }
 
-    m_positionOffsetInContent = Range::create(document, backwardsRange->endPosition(), position)->text().length();
-    m_contentRange = Range::create(document, backwardsRange->endPosition(), forwardRange->startPosition());
+    m_positionOffsetInContent = Range::create(*document, backwardsRange->endPosition(), position)->text().length();
+    m_contentRange = Range::create(*document, backwardsRange->endPosition(), forwardRange->startPosition());
     ASSERT(m_contentRange);
 }
 
 PassRefPtr<Range> SurroundingText::rangeFromContentOffsets(unsigned startOffsetInContent, unsigned endOffsetInContent)
 {
     if (startOffsetInContent >= endOffsetInContent || endOffsetInContent > content().length())
         return 0;
 
     CharacterIterator iterator(m_contentRange.get());
 
     ASSERT(!iterator.atEnd());
     iterator.advance(startOffsetInContent);
 
     ASSERT(iterator.range());
     Position start = iterator.range()->startPosition();
 
     ASSERT(!iterator.atEnd());
     iterator.advance(endOffsetInContent - startOffsetInContent);
 
     ASSERT(iterator.range());
     Position end = iterator.range()->startPosition();
 
-    return Range::create(start.document(), start, end);
+    ASSERT(start.document());
+    return Range::create(*start.document(), start, end);
 }
 
 String SurroundingText::content() const
 {
     if (m_contentRange)
         return m_contentRange->text();
     return String();
 }
 
 unsigned SurroundingText::positionOffsetInContent() const
 {
     return m_positionOffsetInContent;
 }
 
 } // namespace WebCore