Fix blink_perf.paint regression about tables

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

Index: third_party/WebKit/Source/core/layout/LayoutTable.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutTable.cpp b/third_party/WebKit/Source/core/layout/LayoutTable.cpp
index a541b242260e9fc510be933094d0f12474574e54..0b7a709d1b2b7b199213d8646e457c5a73c43f17 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTable.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutTable.cpp
@@ -1486,9 +1486,7 @@ LayoutTableCell* LayoutTable::cellBefore(const LayoutTableCell* cell) const {
     return nullptr;
 
   // If we hit a colspan back up to a real cell.
-  LayoutTableSection::CellStruct& prevCell =
-      section->cellAt(cell->rowIndex(), effCol - 1);
-  return prevCell.primaryCell();
+  return section->primaryCellAt(cell->rowIndex(), effCol - 1);
 }
 
 LayoutTableCell* LayoutTable::cellAfter(const LayoutTableCell* cell) const {