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

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 0bc54b1b9749f9fc418cff2509343ec5083135b4..6a4f0e2b59f2e4631bfc56e442dcc7cd3e0cbe94 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -1081,6 +1081,11 @@ PassRefPtrWillBeRawPtr<Element> Document::createElement(const QualifiedName& qNa
     return e.release();
 }
 
+bool Document::regionBasedColumnsEnabled() const
+{
+    return settings() && settings()->regionBasedColumnsEnabled();
+}
+
 String Document::readyState() const
 {
     DEFINE_STATIC_LOCAL(const String, loading, ("loading"));