Enable new multicol for testing and experimental web platform features.

Source/core/layout/LayoutTestHelper.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/layout/LayoutTestHelper.h"
 
 #include "core/loader/EmptyClients.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/graphics/GraphicsLayerFactory.h"
@@ skipping 17 matching lines @@
     }
 };
 
 void RenderingTest::SetUp()
 {
     fillWithEmptyClients(m_pageClients);
     static FakeChromeClient* chromeClient = adoptPtr(new FakeChromeClient).leakPtr();
     m_pageClients.chromeClient = chromeClient;
     m_pageHolder = DummyPageHolder::create(IntSize(800, 600), &m_pageClients);
 
-    document().settings()->setRegionBasedColumnsEnabled(true);
-
     // This ensures that the minimal DOM tree gets attached
     // correctly for tests that don't call setBodyInnerHTML.
     document().view()->updateLayoutAndStyleIfNeededRecursive();
 }
 
 
 } // namespace blink