No need to detect change in size when opting for PositionedMovementLayout

Source/core/rendering/RenderBox.h

Index: Source/core/rendering/RenderBox.h
diff --git a/Source/core/rendering/RenderBox.h b/Source/core/rendering/RenderBox.h
index 9b7ae9b1ad6fcac64f38158fc986ea60f52094aa..fcdf2f6adfadb2a1b2e5d9496de59d4188ccc402 100644
--- a/Source/core/rendering/RenderBox.h
+++ b/Source/core/rendering/RenderBox.h
@@ -507,8 +507,6 @@ public:
         LogicalExtentComputedValues computedValues;
         logicalExtentAfterUpdatingLogicalWidth(logicalTop(), computedValues);
         // If we shrink to fit our width may have changed, so we still need full layout.
-        // FIXME: We check for potential change of width when deciding to set needsPositionedMovementLayout.
-        // So either that check or this one is unnecessary, probably the former. crbug.com/428050
         if (oldWidth != computedValues.m_extent)
             return false;
         setLogicalWidth(computedValues.m_extent);