Make RenderObject::style() return a const object

Source/core/paint/InlineFlowBoxPainter.cpp

Index: Source/core/paint/InlineFlowBoxPainter.cpp
diff --git a/Source/core/paint/InlineFlowBoxPainter.cpp b/Source/core/paint/InlineFlowBoxPainter.cpp
index 98a7722fb12a278fa98e2535c199ca5871a93922..ea3ee1b289903290923248e0e878fe937629e8c0 100644
--- a/Source/core/paint/InlineFlowBoxPainter.cpp
+++ b/Source/core/paint/InlineFlowBoxPainter.cpp
@@ -117,7 +117,7 @@ void InlineFlowBoxPainter::paintFillLayer(const PaintInfo& paintInfo, const Colo
     }
 }
 
-void InlineFlowBoxPainter::paintBoxShadow(const PaintInfo& info, RenderStyle* s, ShadowStyle shadowStyle, const LayoutRect& paintRect)
+void InlineFlowBoxPainter::paintBoxShadow(const PaintInfo& info, const RenderStyle* s, ShadowStyle shadowStyle, const LayoutRect& paintRect)
 {
     if ((!m_inlineFlowBox.prevLineBox() && !m_inlineFlowBox.nextLineBox()) || !m_inlineFlowBox.parent()) {
         BoxPainter::paintBoxShadow(info, paintRect, s, shadowStyle);
@@ -132,7 +132,7 @@ void InlineFlowBoxPainter::paintBoxShadow(const PaintInfo& info, RenderStyle* s,
 static LayoutRect clipRectForNinePieceImageStrip(InlineFlowBox* box, const NinePieceImage& image, const LayoutRect& paintRect)
 {
     LayoutRect clipRect(paintRect);
-    RenderStyle* style = box->renderer().style();
+    const RenderStyle* style = box->renderer().style();
     LayoutRectOutsets outsets = style->imageOutsets(image);
     if (box->isHorizontal()) {
         clipRect.setY(paintRect.y() - outsets.top());
@@ -194,7 +194,7 @@ void InlineFlowBoxPainter::paintBoxDecorationBackground(const PaintInfo& paintIn
 
     // You can use p::first-line to specify a background. If so, the root line boxes for
     // a line may actually have to paint a background.
-    RenderStyle* styleToUse = m_inlineFlowBox.renderer().style(m_inlineFlowBox.isFirstLineStyle());
+    const RenderStyle* styleToUse = m_inlineFlowBox.renderer().style(m_inlineFlowBox.isFirstLineStyle());
     bool shouldPaintBoxDecorationBackground;
     if (m_inlineFlowBox.parent())
         shouldPaintBoxDecorationBackground = m_inlineFlowBox.renderer().hasBoxDecorationBackground();