Revert Enable new multicol for testing and experimental web platform features.

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 785440e5b369ba562a2a6c7c0828752e5a981a39..c832a24fbfaaf5621989d0c0e69e24480a4b721c 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -314,6 +314,8 @@ public:
     PassRefPtrWillBeRawPtr<Element> createElementNS(const AtomicString& namespaceURI, const AtomicString& qualifiedName, ExceptionState&);
     PassRefPtrWillBeRawPtr<Element> createElement(const QualifiedName&, bool createdByParser);
 
+    bool regionBasedColumnsEnabled() const;
+
     Element* elementFromPoint(int x, int y) const;
     Vector<Element*> elementsFromPoint(int x, int y) const;
     PassRefPtrWillBeRawPtr<Range> caretRangeFromPoint(int x, int y);