Cleanup: Remove LayoutRegion.

Source/core/paint/DeprecatedPaintLayer.cpp

Index: Source/core/paint/DeprecatedPaintLayer.cpp
diff --git a/Source/core/paint/DeprecatedPaintLayer.cpp b/Source/core/paint/DeprecatedPaintLayer.cpp
index 5d70439d08a9bafe87cde8292b7d740f4ab4abf3..1f524ab0a7e9a3a5fed45bcb9220e2c2cf309c03 100644
--- a/Source/core/paint/DeprecatedPaintLayer.cpp
+++ b/Source/core/paint/DeprecatedPaintLayer.cpp
@@ -1359,7 +1359,7 @@ static inline const DeprecatedPaintLayer* accumulateOffsetTowardsAncestor(const
     // FIXME: Positioning of out-of-flow(fixed, absolute) elements collected in a LayoutFlowThread
     // may need to be revisited in a future patch.
     // If the fixed layoutObject is inside a LayoutFlowThread, we should not compute location using localToAbsolute,
-    // since localToAbsolute maps the coordinates from flow thread to regions coordinates and regions can be
+    // since localToAbsolute maps the coordinates from flow thread to column set coordinates and column sets can be
     // positioned in a completely different place in the viewport (LayoutView).
     if (position == FixedPosition && (!ancestorLayer || ancestorLayer == layoutObject->view()->layer())) {
         // If the fixed layer's container is the root, just add in the offset of the view. We can obtain this by calling