[Oilpan] Replace a raw pointer to RawPtrWillBeMember to estimate size

third_party/WebKit/Source/core/css/StylePropertySet.cpp

Index: third_party/WebKit/Source/core/css/StylePropertySet.cpp
diff --git a/third_party/WebKit/Source/core/css/StylePropertySet.cpp b/third_party/WebKit/Source/core/css/StylePropertySet.cpp
index e8d5465910a67063a90db27a7138ee8e45a57e17..62200c2b375ab05ed69fe1f11569e1eacd91c292 100644
--- a/third_party/WebKit/Source/core/css/StylePropertySet.cpp
+++ b/third_party/WebKit/Source/core/css/StylePropertySet.cpp
@@ -42,7 +42,7 @@ namespace blink {
 
 static size_t sizeForImmutableStylePropertySetWithPropertyCount(unsigned count)
 {
-    return sizeof(ImmutableStylePropertySet) - sizeof(void*) + sizeof(CSSValue*) * count + sizeof(StylePropertyMetadata) * count;
+    return sizeof(ImmutableStylePropertySet) - sizeof(void*) + sizeof(RawPtrWillBeMember<CSSValue>) * count + sizeof(StylePropertyMetadata) * count;
 }
 
 PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> ImmutableStylePropertySet::create(const CSSProperty* properties, unsigned count, CSSParserMode cssParserMode)