Pass RenderStyle / RenderObject by reference in more places

Source/core/css/CSSValuePool.cpp

Index: Source/core/css/CSSValuePool.cpp
diff --git a/Source/core/css/CSSValuePool.cpp b/Source/core/css/CSSValuePool.cpp
index 140dc727cc957dfcb9ea32f2c2acac3c5fa0e78f..dda959c19075236e06ec3844628e2801a23b884e 100644
--- a/Source/core/css/CSSValuePool.cpp
+++ b/Source/core/css/CSSValuePool.cpp
@@ -116,9 +116,9 @@ PassRefPtr<CSSPrimitiveValue> CSSValuePool::createValue(double value, CSSPrimiti
     return cache[intValue];
 }
 
-PassRefPtr<CSSPrimitiveValue> CSSValuePool::createValue(const Length& value, const RenderStyle* style)
+PassRefPtr<CSSPrimitiveValue> CSSValuePool::createValue(const Length& value, const RenderStyle& style)
 {
-    return CSSPrimitiveValue::create(value, style->effectiveZoom());
+    return CSSPrimitiveValue::create(value, style.effectiveZoom());
 }
 
 PassRefPtr<CSSPrimitiveValue> CSSValuePool::createFontFamilyValue(const String& familyName)