Remove enclosingLayoutRect calls per FIXME. These are hot in profiles.

Source/core/layout/line/InlineFlowBox.h

Index: Source/core/layout/line/InlineFlowBox.h
diff --git a/Source/core/layout/line/InlineFlowBox.h b/Source/core/layout/line/InlineFlowBox.h
index 9b8842439d53a48908aea2119a0f395c78504464..52c888590325098f4beaef8c64584746ead09290 100644
--- a/Source/core/layout/line/InlineFlowBox.h
+++ b/Source/core/layout/line/InlineFlowBox.h
@@ -215,9 +215,7 @@ public:
     // respectively are flipped when compared to their physical counterparts.  For example minX is on the left in vertical-lr, but it is on the right in vertical-rl.
     LayoutRect layoutOverflowRect(LayoutUnit lineTop, LayoutUnit lineBottom) const
     {
-        // FIXME: the call to enclosingLayoutRect() below is temporary and should be removed once
-        // the transition to LayoutUnit-based types is complete (crbug.com/321237)
-        return m_overflow ? m_overflow->layoutOverflowRect() : enclosingLayoutRect(frameRectIncludingLineHeight(lineTop, lineBottom));
+        return m_overflow ? m_overflow->layoutOverflowRect() : frameRectIncludingLineHeight(lineTop, lineBottom);
     }
     LayoutUnit logicalTopLayoutOverflow(LayoutUnit lineTop) const
     {
@@ -241,9 +239,7 @@ public:
 
     LayoutRect visualOverflowRect(LayoutUnit lineTop, LayoutUnit lineBottom) const
     {
-        // FIXME: the call to enclosingLayoutRect() below is temporary and should be removed once
-        // the transition to LayoutUnit-based types is complete (crbug.com/321237)
-        return m_overflow ? m_overflow->visualOverflowRect() : enclosingLayoutRect(frameRectIncludingLineHeight(lineTop, lineBottom));
+        return m_overflow ? m_overflow->visualOverflowRect() : frameRectIncludingLineHeight(lineTop, lineBottom);
     }
     LayoutUnit logicalLeftVisualOverflow() const { return m_overflow ? (isHorizontal() ? m_overflow->visualOverflowRect().x() : m_overflow->visualOverflowRect().y()) : logicalLeft(); }
     LayoutUnit logicalRightVisualOverflow() const { return m_overflow ? (isHorizontal() ? m_overflow->visualOverflowRect().maxX() : m_overflow->visualOverflowRect().maxY()) : static_cast<LayoutUnit>(logicalRight().ceil()); }