Remove CSS regions support, keeping a bare minimum to support "region-based" multicol.

Source/core/rendering/FixedTableLayout.cpp

Index: Source/core/rendering/FixedTableLayout.cpp
diff --git a/Source/core/rendering/FixedTableLayout.cpp b/Source/core/rendering/FixedTableLayout.cpp
index 83cc6cebe969a852f2c4094d2f7770ff95e88f45..195d9af16cf68cc97a4c8ae7086f24b3aea3c61d 100644
--- a/Source/core/rendering/FixedTableLayout.cpp
+++ b/Source/core/rendering/FixedTableLayout.cpp
@@ -148,7 +148,7 @@ int FixedTableLayout::calcWidthArray()
         unsigned span = cell->colSpan();
         int fixedBorderBoxLogicalWidth = 0;
         // FIXME: Support other length types. If the width is non-auto, it should probably just use
-        // RenderBox::computeLogicalWidthInRegionUsing to compute the width.
+        // RenderBox::computeLogicalWidthUsing to compute the width.
         if (logicalWidth.isFixed() && logicalWidth.isPositive()) {
             fixedBorderBoxLogicalWidth = cell->adjustBorderBoxLogicalWidthForBoxSizing(logicalWidth.value());
             logicalWidth.setValue(fixedBorderBoxLogicalWidth);