Remove multicol special-cases from invalidation and the pre-paint tree walk

third_party/WebKit/Source/core/layout/LayoutMultiColumnSpannerPlaceholder.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 "core/layout/LayoutMultiColumnSpannerPlaceholder.h"
 
 #include "core/layout/LayoutMultiColumnFlowThread.h"
 
 namespace blink {
 
@@ skipping 123 matching lines @@
 void LayoutMultiColumnSpannerPlaceholder::computeLogicalHeight(
     LayoutUnit,
     LayoutUnit logicalTop,
     LogicalExtentComputedValues& computedValues) const {
   computedValues.m_extent = m_layoutObjectInFlowThread->logicalHeight();
   computedValues.m_position = logicalTop;
   computedValues.m_margins.m_before = marginBefore();
   computedValues.m_margins.m_after = marginAfter();
 }
 
-void LayoutMultiColumnSpannerPlaceholder::invalidatePaintOfSubtreesIfNeeded(
-    const PaintInvalidationState& childPaintInvalidationState) {
-  m_layoutObjectInFlowThread->invalidateTreeIfNeeded(
-      childPaintInvalidationState);
-  LayoutBox::invalidatePaintOfSubtreesIfNeeded(childPaintInvalidationState);
-}
-
 void LayoutMultiColumnSpannerPlaceholder::paint(
     const PaintInfo& paintInfo,
     const LayoutPoint& paintOffset) const {
   if (!m_layoutObjectInFlowThread->hasSelfPaintingLayer())
     m_layoutObjectInFlowThread->paint(paintInfo, paintOffset);
 }
 
 bool LayoutMultiColumnSpannerPlaceholder::nodeAtPoint(
     HitTestResult& result,
     const HitTestLocation& locationInContainer,
     const LayoutPoint& accumulatedOffset,
     HitTestAction action) {
   return !m_layoutObjectInFlowThread->hasSelfPaintingLayer() &&
          m_layoutObjectInFlowThread->nodeAtPoint(result, locationInContainer,
                                                  accumulatedOffset, action);
 }
 
 }  // namespace blink