Have Range constructor take a Document reference in argument

Source/core/editing/SurroundingText.cpp

Index: Source/core/editing/SurroundingText.cpp
diff --git a/Source/core/editing/SurroundingText.cpp b/Source/core/editing/SurroundingText.cpp
index aaa1d63b56deff82ece140864d5d37e7ef647fe5..e90e9e717e80730740239761e32c9f5a7d2ab114 100644
--- a/Source/core/editing/SurroundingText.cpp
+++ b/Source/core/editing/SurroundingText.cpp
@@ -52,8 +52,9 @@ SurroundingText::SurroundingText(const VisiblePosition& visiblePosition, unsigne
 
     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;
     }
@@ -68,8 +69,8 @@ SurroundingText::SurroundingText(const VisiblePosition& visiblePosition, unsigne
         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);
 }
 
@@ -92,7 +93,8 @@ PassRefPtr<Range> SurroundingText::rangeFromContentOffsets(unsigned startOffsetI
     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