Change LayoutState to be stack-allocated

Source/core/rendering/RenderTableSection.cpp

Index: Source/core/rendering/RenderTableSection.cpp
diff --git a/Source/core/rendering/RenderTableSection.cpp b/Source/core/rendering/RenderTableSection.cpp
index 0180cd131718d7fabd1d074ad3c31d9fdf087b87..2a94548a3a4bafb76dd305a469e40c2755daea07 100644
--- a/Source/core/rendering/RenderTableSection.cpp
+++ b/Source/core/rendering/RenderTableSection.cpp
@@ -642,7 +642,8 @@ int RenderTableSection::calcRowLogicalHeight()
 
     RenderTableCell* cell;
 
-    LayoutStateMaintainer statePusher(*this);
+    // FIXME: This shouldn't use the same constructor as RenderView.
+    LayoutState state(*this);
 
     m_rowPos.resize(m_grid.size() + 1);
 
@@ -695,11 +696,6 @@ int RenderTableSection::calcRowLogicalHeight()
                 ASSERT(cell->rowSpan() == 1);
 
                 if (cell->hasOverrideHeight()) {
-                    if (!statePusher.didPush()) {
-                        // Technically, we should also push state for the row, but since
-                        // rows don't push a coordinate transform, that's not necessary.
-                        statePusher.push(*this, locationOffset());
-                    }
                     cell->clearIntrinsicPadding();
                     cell->clearOverrideSize();
                     cell->forceChildLayout();
@@ -735,7 +731,7 @@ void RenderTableSection::layout()
     // can be called in a loop (e.g during parsing). Doing it now ensures we have a stable-enough structure.
     m_grid.shrinkToFit();
 
-    LayoutStateMaintainer statePusher(*this, locationOffset());
+    LayoutState state(*this, locationOffset());
 
     const Vector<int>& columnPos = table()->columnPositions();
 
@@ -892,7 +888,7 @@ void RenderTableSection::layoutRows()
     int vspacing = table()->vBorderSpacing();
     unsigned nEffCols = table()->numEffCols();
 
-    LayoutStateMaintainer statePusher(*this, locationOffset());
+    LayoutState state(*this, locationOffset());
 
     for (unsigned r = 0; r < totalRows; r++) {
         // Set the row's x/y position and width/height.