Oilpan: move Range object to the oilpan heap.

Source/core/editing/SpellChecker.h

Index: Source/core/editing/SpellChecker.h
diff --git a/Source/core/editing/SpellChecker.h b/Source/core/editing/SpellChecker.h
index c1b978859d507c80236eddccfe08ba16902035df..7b5811e90b5111f021d303bf24120a0ddd167d92 100644
--- a/Source/core/editing/SpellChecker.h
+++ b/Source/core/editing/SpellChecker.h
@@ -59,7 +59,7 @@ public:
     bool isSpellCheckingEnabledInFocusedNode() const;
     bool isSpellCheckingEnabledFor(Node*) const;
     void markMisspellingsAfterTypingToWord(const VisiblePosition &wordStart, const VisibleSelection& selectionAfterTyping);
-    void markMisspellings(const VisibleSelection&, RefPtr<Range>& firstMisspellingRange);
+    void markMisspellings(const VisibleSelection&, RefPtrWillBeRawPtr<Range>& firstMisspellingRange);
     void markBadGrammar(const VisibleSelection&);
     void markMisspellingsAndBadGrammar(const VisibleSelection& spellingSelection, bool markGrammar, const VisibleSelection& grammarSelection);
     void markAndReplaceFor(PassRefPtr<SpellCheckRequest>, const Vector<TextCheckingResult>&);
@@ -89,7 +89,7 @@ private:
 
     explicit SpellChecker(LocalFrame&);
 
-    void markMisspellingsOrBadGrammar(const VisibleSelection&, bool checkSpelling, RefPtr<Range>& firstMisspellingRange);
+    void markMisspellingsOrBadGrammar(const VisibleSelection&, bool checkSpelling, RefPtrWillBeRawPtr<Range>& firstMisspellingRange);
     TextCheckingTypeMask resolveTextCheckingTypeMask(TextCheckingTypeMask);
 
     bool unifiedTextCheckerEnabled() const;