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

Source/core/editing/TextCheckingHelper.cpp

Index: Source/core/editing/TextCheckingHelper.cpp
diff --git a/Source/core/editing/TextCheckingHelper.cpp b/Source/core/editing/TextCheckingHelper.cpp
index c6e89bdd2aebf64cf09f74ad8755f94816cdef18..63aae0c0e28cb6660a562f456f734f5145477b56 100644
--- a/Source/core/editing/TextCheckingHelper.cpp
+++ b/Source/core/editing/TextCheckingHelper.cpp
@@ -181,7 +181,7 @@ PassRefPtr<Range> TextCheckingParagraph::offsetAsRange() const
 {
     ASSERT(m_checkingRange);
     if (!m_offsetAsRange)
-        m_offsetAsRange = Range::create(paragraphRange()->startContainer()->document(), paragraphRange()->startPosition(), checkingRange()->startPosition());
+        m_offsetAsRange = Range::create(&paragraphRange()->startContainer()->document(), paragraphRange()->startPosition(), checkingRange()->startPosition());
 
     return m_offsetAsRange;
 }
@@ -270,7 +270,7 @@ String TextCheckingHelper::findFirstMisspelling(int& firstMisspellingOffset, boo
                 }
 
                 // Store marker for misspelled word.
-                misspellingRange->startContainer()->document()->markers()->addMarker(misspellingRange.get(), DocumentMarker::Spelling);
+                misspellingRange->startContainer()->document().markers()->addMarker(misspellingRange.get(), DocumentMarker::Spelling);
 
                 // Bail out if we're marking only the first misspelling, and not all instances.
                 if (!markAll)
@@ -310,7 +310,7 @@ String TextCheckingHelper::findFirstMisspellingOrBadGrammar(bool checkGrammar, b
     int totalRangeLength = TextIterator::rangeLength(paragraphRange.get());
     setEnd(paragraphRange.get(), endOfParagraph(m_range->startPosition()));
 
-    RefPtr<Range> offsetAsRange = Range::create(paragraphRange->startContainer()->document(), paragraphRange->startPosition(), m_range->startPosition());
+    RefPtr<Range> offsetAsRange = Range::create(&paragraphRange->startContainer()->document(), paragraphRange->startPosition(), m_range->startPosition());
     int rangeStartOffset = TextIterator::rangeLength(offsetAsRange.get());
     int totalLengthProcessed = 0;
 
@@ -324,7 +324,7 @@ String TextCheckingHelper::findFirstMisspellingOrBadGrammar(bool checkGrammar, b
         if (inSameParagraph(paragraphRange->startPosition(), m_range->endPosition())) {
             // Determine the character offset from the end of the original search range to the end of the paragraph,
             // since we will want to ignore results in this area.
-            RefPtr<Range> endOffsetAsRange = Range::create(paragraphRange->startContainer()->document(), paragraphRange->startPosition(), m_range->endPosition());
+            RefPtr<Range> endOffsetAsRange = Range::create(&paragraphRange->startContainer()->document(), paragraphRange->startPosition(), m_range->endPosition());
             currentEndOffset = TextIterator::rangeLength(endOffsetAsRange.get());
             lastIteration = true;
         }
@@ -377,7 +377,7 @@ String TextCheckingHelper::findFirstMisspellingOrBadGrammar(bool checkGrammar, b
                 if (!misspelledWord.isEmpty() && (!checkGrammar || badGrammarPhrase.isEmpty() || spellingLocation <= grammarDetailLocation)) {
                     int spellingOffset = spellingLocation - currentStartOffset;
                     if (!firstIteration) {
-                        RefPtr<Range> paragraphOffsetAsRange = Range::create(paragraphRange->startContainer()->document(), m_range->startPosition(), paragraphRange->startPosition());
+                        RefPtr<Range> paragraphOffsetAsRange = Range::create(&paragraphRange->startContainer()->document(), m_range->startPosition(), paragraphRange->startPosition());
                         spellingOffset += TextIterator::rangeLength(paragraphOffsetAsRange.get());
                     }
                     outIsSpelling = true;
@@ -388,7 +388,7 @@ String TextCheckingHelper::findFirstMisspellingOrBadGrammar(bool checkGrammar, b
                 if (checkGrammar && !badGrammarPhrase.isEmpty()) {
                     int grammarPhraseOffset = grammarPhraseLocation - currentStartOffset;
                     if (!firstIteration) {
-                        RefPtr<Range> paragraphOffsetAsRange = Range::create(paragraphRange->startContainer()->document(), m_range->startPosition(), paragraphRange->startPosition());
+                        RefPtr<Range> paragraphOffsetAsRange = Range::create(&paragraphRange->startContainer()->document(), m_range->startPosition(), paragraphRange->startPosition());
                         grammarPhraseOffset += TextIterator::rangeLength(paragraphOffsetAsRange.get());
                     }
                     outIsSpelling = false;
@@ -431,7 +431,7 @@ int TextCheckingHelper::findFirstGrammarDetail(const Vector<GrammarDetail>& gram
 
         if (markAll) {
             RefPtr<Range> badGrammarRange = TextIterator::subrange(m_range.get(), badGrammarPhraseLocation - startOffset + detail->location, detail->length);
-            badGrammarRange->startContainer()->document()->markers()->addMarker(badGrammarRange.get(), DocumentMarker::Grammar, detail->userDescription);
+            badGrammarRange->startContainer()->document().markers()->addMarker(badGrammarRange.get(), DocumentMarker::Grammar, detail->userDescription);
         }
 
         // Remember this detail only if it's earlier than our current candidate (the details aren't in a guaranteed order)