Oilpan: Reapply: Remove all the RefPtrs and most of the raw pointers to style

Source/core/css/CSSImportRule.cpp

Index: Source/core/css/CSSImportRule.cpp
diff --git a/Source/core/css/CSSImportRule.cpp b/Source/core/css/CSSImportRule.cpp
index 8d5af2f77094b536a80fbebe88197d11685b9008..e7d6219cbc1546c58aab9317b4eb6fb0dbaaf5a1 100644
--- a/Source/core/css/CSSImportRule.cpp
+++ b/Source/core/css/CSSImportRule.cpp
@@ -41,9 +41,7 @@ CSSImportRule::~CSSImportRule()
 #if !ENABLE(OILPAN)
     if (m_styleSheetCSSOMWrapper)
         m_styleSheetCSSOMWrapper->clearOwnerRule();
-    // MediaList and the parent CSSImportRule are both on the oilpan heap and die together.
-    // Therefor clearing is not needed nor allowed since it could be touching already
-    // finalized memory.
+
     if (m_mediaCSSOMWrapper)
         m_mediaCSSOMWrapper->clearParentRule();
 #endif // ENABLE(OILPAN)