Constify and use LayoutStyle reference in layout/

Source/core/layout/line/EllipsisBox.cpp

Index: Source/core/layout/line/EllipsisBox.cpp
diff --git a/Source/core/layout/line/EllipsisBox.cpp b/Source/core/layout/line/EllipsisBox.cpp
index d338d14ae1a612493d075c5505bbe08cdf3f7623..3c86053f546438d5d5eccecd6ae2c3ac7ed76016 100644
--- a/Source/core/layout/line/EllipsisBox.cpp
+++ b/Source/core/layout/line/EllipsisBox.cpp
@@ -72,9 +72,9 @@ bool EllipsisBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& resu
 
     // Hit test the markup box.
     if (InlineBox* markupBox = this->markupBox()) {
-        LayoutStyle* style = renderer().style(isFirstLineStyle());
+        const LayoutStyle& style = renderer().styleRef(isFirstLineStyle());
         LayoutUnit mtx = adjustedLocation.x() + m_logicalWidth - markupBox->x();
-        LayoutUnit mty = adjustedLocation.y() + style->fontMetrics().ascent() - (markupBox->y() + markupBox->renderer().style(isFirstLineStyle())->fontMetrics().ascent());
+        LayoutUnit mty = adjustedLocation.y() + style.fontMetrics().ascent() - (markupBox->y() + markupBox->renderer().style(isFirstLineStyle())->fontMetrics().ascent());
         if (markupBox->nodeAtPoint(request, result, locationInContainer, LayoutPoint(mtx, mty), lineTop, lineBottom)) {
             renderer().updateHitTestResult(result, locationInContainer.point() - LayoutSize(mtx, mty));
             return true;