Cleanup: Remove LayoutRegion.

Source/core/paint/MultiColumnSetPainter.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/paint/MultiColumnSetPainter.h"
 
 #include "core/layout/LayoutMultiColumnSet.h"
 #include "core/paint/BlockPainter.h"
 #include "core/paint/BoxPainter.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/PaintInfo.h"
 #include "platform/geometry/LayoutPoint.h"
 
 namespace blink {
 
 void MultiColumnSetPainter::paintObject(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     if (m_layoutMultiColumnSet.style()->visibility() != VISIBLE)
         return;
 
     BlockPainter(m_layoutMultiColumnSet).paintObject(paintInfo, paintOffset);
 
     // FIXME: Right now we're only painting in the foreground phase.
     // Columns should technically respect phases and allow for background/float/foreground overlap etc., just like
     // LayoutBlocks do. Note this is a pretty minor issue, since the old column implementation clipped columns
     // anyway, thus making it impossible for them to overlap one another. It's also really unlikely that the columns
     // would overlap another block.
-    if (!m_layoutMultiColumnSet.flowThread() || !m_layoutMultiColumnSet.isValid() || (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection))
+    if (!m_layoutMultiColumnSet.flowThread() || (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection))
         return;
 
     paintColumnRules(paintInfo, paintOffset);
 }
 
 void MultiColumnSetPainter::paintColumnRules(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     if (m_layoutMultiColumnSet.flowThread()->isLayoutPagedFlowThread())
         return;
 
@@ skipping 45 matching lines @@
             LayoutUnit ruleBottom = m_layoutMultiColumnSet.isHorizontalWritingMode() ? ruleTop + m_layoutMultiColumnSet.contentHeight() : ruleTop + ruleThickness;
             IntRect pixelSnappedRuleRect = pixelSnappedIntRectFromEdges(ruleLeft, ruleTop, ruleRight, ruleBottom);
             ObjectPainter::drawLineForBoxSide(paintInfo.context, pixelSnappedRuleRect.x(), pixelSnappedRuleRect.y(), pixelSnappedRuleRect.maxX(), pixelSnappedRuleRect.maxY(), boxSide, ruleColor, ruleStyle, 0, 0, antialias);
         }
 
         ruleLogicalLeft = currLogicalLeftOffset;
     }
 }
 
 } // namespace blink