Pass RenderStyle / RenderObject by reference in more places

Source/core/css/CSSValuePool.h

Index: Source/core/css/CSSValuePool.h
diff --git a/Source/core/css/CSSValuePool.h b/Source/core/css/CSSValuePool.h
index 02376a09793a73510c5078fe2eafe846002a474d..75b8984a1f7f78b6f57d9f47807aa47aedfec649 100644
--- a/Source/core/css/CSSValuePool.h
+++ b/Source/core/css/CSSValuePool.h
@@ -52,7 +52,7 @@ public:
     PassRefPtr<CSSPrimitiveValue> createColorValue(unsigned rgbValue);
     PassRefPtr<CSSPrimitiveValue> createValue(double value, CSSPrimitiveValue::UnitTypes);
     PassRefPtr<CSSPrimitiveValue> createValue(const String& value, CSSPrimitiveValue::UnitTypes type) { return CSSPrimitiveValue::create(value, type); }
-    PassRefPtr<CSSPrimitiveValue> createValue(const Length& value, const RenderStyle*);
+    PassRefPtr<CSSPrimitiveValue> createValue(const Length& value, const RenderStyle&);
     PassRefPtr<CSSPrimitiveValue> createValue(const Length& value, float zoom) { return CSSPrimitiveValue::create(value, zoom); }
     template<typename T> static PassRefPtr<CSSPrimitiveValue> createValue(T value) { return CSSPrimitiveValue::create(value); }