Make RenderObject::style() return a const object

Source/core/layout/LayoutThemeChromiumSkia.cpp

Index: Source/core/layout/LayoutThemeChromiumSkia.cpp
diff --git a/Source/core/layout/LayoutThemeChromiumSkia.cpp b/Source/core/layout/LayoutThemeChromiumSkia.cpp
index 3f3980f572da3b2a86f442bdb03fecf09b45580a..4d1df649936d085d430505e64635a66b3ba4f58e 100644
--- a/Source/core/layout/LayoutThemeChromiumSkia.cpp
+++ b/Source/core/layout/LayoutThemeChromiumSkia.cpp
@@ -132,7 +132,7 @@ void LayoutThemeChromiumSkia::systemFont(CSSValueID systemFontID, FontStyle& fon
     LayoutThemeChromiumFontProvider::systemFont(systemFontID, fontStyle, fontWeight, fontSize, fontFamily);
 }
 
-int LayoutThemeChromiumSkia::minimumMenuListSize(RenderStyle* style) const
+int LayoutThemeChromiumSkia::minimumMenuListSize(const RenderStyle* style) const
 {
     return 0;
 }
@@ -373,22 +373,22 @@ bool LayoutThemeChromiumSkia::paintMenuListButton(RenderObject* o, const PaintIn
     return paintMenuList(o, i, rect);
 }
 
-int LayoutThemeChromiumSkia::popupInternalPaddingLeft(RenderStyle* style) const
+int LayoutThemeChromiumSkia::popupInternalPaddingLeft(const RenderStyle* style) const
 {
     return menuListInternalPadding(style, LeftPadding);
 }
 
-int LayoutThemeChromiumSkia::popupInternalPaddingRight(RenderStyle* style) const
+int LayoutThemeChromiumSkia::popupInternalPaddingRight(const RenderStyle* style) const
 {
     return menuListInternalPadding(style, RightPadding);
 }
 
-int LayoutThemeChromiumSkia::popupInternalPaddingTop(RenderStyle* style) const
+int LayoutThemeChromiumSkia::popupInternalPaddingTop(const RenderStyle* style) const
 {
     return menuListInternalPadding(style, TopPadding);
 }
 
-int LayoutThemeChromiumSkia::popupInternalPaddingBottom(RenderStyle* style) const
+int LayoutThemeChromiumSkia::popupInternalPaddingBottom(const RenderStyle* style) const
 {
     return menuListInternalPadding(style, BottomPadding);
 }
@@ -409,7 +409,7 @@ int LayoutThemeChromiumSkia::menuListArrowPadding() const
     return ScrollbarTheme::theme()->scrollbarThickness();
 }
 
-int LayoutThemeChromiumSkia::menuListInternalPadding(RenderStyle* style, int paddingType) const
+int LayoutThemeChromiumSkia::menuListInternalPadding(const RenderStyle* style, int paddingType) const
 {
     // This internal padding is in addition to the user-supplied padding.
     // Matches the FF behavior.