Remove DCHECK in column balancer that failed because of flexbox bugs.

third_party/WebKit/Source/core/layout/ColumnBalancer.cpp

 // Copyright 2015 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/ColumnBalancer.h"
 
 #include "core/layout/LayoutMultiColumnFlowThread.h"
 #include "core/layout/LayoutMultiColumnSet.h"
 #include "core/layout/api/LineLayoutBlockFlow.h"
 
@@ skipping 225 matching lines @@
 
 void InitialColumnHeightFinder::examineLine(const RootInlineBox& line) {
   LayoutUnit lineTop = line.lineTopWithLeading();
   LayoutUnit lineTopInFlowThread = flowThreadOffset() + lineTop;
   LayoutUnit minimumLogialHeight =
       columnLogicalHeightRequirementForLine(line.block().styleRef(), line);
   if (lineTopInFlowThread < LayoutUnit())
     minimumLogialHeight += lineTopInFlowThread;
   m_tallestUnbreakableLogicalHeight =
       std::max(m_tallestUnbreakableLogicalHeight, minimumLogialHeight);
-  DCHECK(
-      isFirstAfterBreak(lineTopInFlowThread) || !line.paginationStrut() ||
-      !isLogicalTopWithinBounds(lineTopInFlowThread - line.paginationStrut()));
   if (isFirstAfterBreak(lineTopInFlowThread) &&
       m_lastBreakSeen != lineTopInFlowThread) {
     m_lastBreakSeen = lineTopInFlowThread;
     recordStrutBeforeOffset(lineTopInFlowThread, line.paginationStrut());
   }
 }
 
 void InitialColumnHeightFinder::recordStrutBeforeOffset(
     LayoutUnit offsetInFlowThread,
     LayoutUnit strut) {
@@ skipping 231 matching lines @@
   if (group.columnLogicalTopForOffset(lineTopInFlowThread) !=
       group.columnLogicalTopForOffset(lineBottomWithOverflow)) {
     LayoutUnit shortage =
         lineBottomWithOverflow -
         group.columnLogicalTopForOffset(lineBottomWithOverflow);
     recordSpaceShortage(shortage);
   }
 }
 
 }  // namespace blink