Make RenderObject::style() return a const object

Source/core/css/resolver/FontBuilder.h

Index: Source/core/css/resolver/FontBuilder.h
diff --git a/Source/core/css/resolver/FontBuilder.h b/Source/core/css/resolver/FontBuilder.h
index 09efe4066af8dd8a1ddcf97f8397c8d20e5be44d..79ff8768d54200dfab23dc9ed93339b6f933f427 100644
--- a/Source/core/css/resolver/FontBuilder.h
+++ b/Source/core/css/resolver/FontBuilder.h
@@ -98,11 +98,11 @@ private:
 
     void setFamilyDescription(FontDescription&, const FontDescription::FamilyDescription&);
     void setSize(FontDescription&, const FontDescription::Size&);
-    void checkForOrientationChange(RenderStyle*);
+    void checkForOrientationChange(const RenderStyle*);
     // This function fixes up the default font size if it detects that the current generic font family has changed. -dwh
-    void checkForGenericFamilyChange(RenderStyle*, const RenderStyle* parentStyle);
-    void updateComputedSize(RenderStyle*, const RenderStyle* parentStyle);
-    void updateComputedSize(FontDescription&, RenderStyle*);
+    void checkForGenericFamilyChange(const RenderStyle*, const RenderStyle* parentStyle);
+    void updateComputedSize(const RenderStyle*, const RenderStyle* parentStyle);
+    void updateComputedSize(FontDescription&, const RenderStyle*);
 
     float getComputedSizeFromSpecifiedSize(FontDescription&, float effectiveZoom, float specifiedSize);