Make RenderObject::style() return a const object

Source/core/css/resolver/StyleAdjuster.cpp

Index: Source/core/css/resolver/StyleAdjuster.cpp
diff --git a/Source/core/css/resolver/StyleAdjuster.cpp b/Source/core/css/resolver/StyleAdjuster.cpp
index 89cdfefc173b462bf453fdb94f5fa806a9b72293..000f207079248b13fe18633a900a7fbbc3196970 100644
--- a/Source/core/css/resolver/StyleAdjuster.cpp
+++ b/Source/core/css/resolver/StyleAdjuster.cpp
@@ -151,7 +151,7 @@ static bool hasWillChangeThatCreatesStackingContext(const RenderStyle* style)
     return false;
 }
 
-void StyleAdjuster::adjustRenderStyle(RenderStyle* style, RenderStyle* parentStyle, Element *e, const CachedUAStyle* cachedUAStyle)
+void StyleAdjuster::adjustRenderStyle(RenderStyle* style, const RenderStyle* parentStyle, Element *e, const CachedUAStyle* cachedUAStyle)
 {
     ASSERT(parentStyle);
 
@@ -336,7 +336,7 @@ void StyleAdjuster::adjustStyleForAlignment(RenderStyle& style, const RenderStyl
     }
 }
 
-void StyleAdjuster::adjustStyleForHTMLElement(RenderStyle* style, RenderStyle* parentStyle, HTMLElement& element)
+void StyleAdjuster::adjustStyleForHTMLElement(RenderStyle* style, const RenderStyle* parentStyle, HTMLElement& element)
 {
     // <div> and <span> are the most common elements on the web, we skip all the work for them.
     if (isHTMLDivElement(element) || isHTMLSpanElement(element))
@@ -457,7 +457,7 @@ void StyleAdjuster::adjustOverflow(RenderStyle* style)
     }
 }
 
-void StyleAdjuster::adjustStyleForDisplay(RenderStyle* style, RenderStyle* parentStyle)
+void StyleAdjuster::adjustStyleForDisplay(RenderStyle* style, const RenderStyle* parentStyle)
 {
     if (style->display() == BLOCK && !style->isFloating())
         return;