Make RenderObject::style() return a const object

Source/core/paint/InlinePainter.cpp

Index: Source/core/paint/InlinePainter.cpp
diff --git a/Source/core/paint/InlinePainter.cpp b/Source/core/paint/InlinePainter.cpp
index 43173e4faac24a61dc3f6f33f3ff2c5d5562cacc..dfa0ace6e0521c820a7b26708f879ea83af8a88c 100644
--- a/Source/core/paint/InlinePainter.cpp
+++ b/Source/core/paint/InlinePainter.cpp
@@ -27,7 +27,7 @@ void InlinePainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOf
 
 void InlinePainter::paintOutline(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
-    RenderStyle* styleToUse = m_renderInline.style();
+    const RenderStyle* styleToUse = m_renderInline.style();
     if (!styleToUse->hasOutline())
         return;
 
@@ -83,7 +83,7 @@ void InlinePainter::paintOutline(const PaintInfo& paintInfo, const LayoutPoint&
 void InlinePainter::paintOutlineForLine(GraphicsContext* graphicsContext, const LayoutPoint& paintOffset,
     const LayoutRect& lastline, const LayoutRect& thisline, const LayoutRect& nextline, const Color outlineColor)
 {
-    RenderStyle* styleToUse = m_renderInline.style();
+    const RenderStyle* styleToUse = m_renderInline.style();
     int outlineWidth = styleToUse->outlineWidth();
     EBorderStyle outlineStyle = styleToUse->outlineStyle();