Pass RenderStyle / RenderObject by reference in more places

Source/core/css/CSSValuePool.cpp

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 98 matching lines @@
         break;
     default:
         return CSSPrimitiveValue::create(value, type);
     }
 
     if (!cache[intValue])
         cache[intValue] = CSSPrimitiveValue::create(value, type);
     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)
 {
     RefPtr<CSSPrimitiveValue>& value = m_fontFamilyValueCache.add(familyName, 0).iterator->value;
     if (!value)
         value = CSSPrimitiveValue::create(familyName, CSSPrimitiveValue::CSS_STRING);
     return value;
 }
 
 PassRefPtr<CSSValueList> CSSValuePool::createFontFaceValue(const AtomicString& string)
 {
     // Just wipe out the cache and start rebuilding if it gets too big.
     const int maximumFontFaceCacheSize = 128;
     if (m_fontFaceValueCache.size() > maximumFontFaceCacheSize)
         m_fontFaceValueCache.clear();
 
     RefPtr<CSSValueList>& value = m_fontFaceValueCache.add(string, 0).iterator->value;
     if (!value)
         value = CSSParser::parseFontFaceValue(string);
     return value;
 }
 
 }