Oilpan: Remove guardRef and guardDeref from TreeScope.

Source/core/html/imports/HTMLImportChild.cpp

Index: Source/core/html/imports/HTMLImportChild.cpp
diff --git a/Source/core/html/imports/HTMLImportChild.cpp b/Source/core/html/imports/HTMLImportChild.cpp
index 2b0c6c9f653109d295bfaacdb4f0eae67b63f633..4b5f65c64056b769776a15d0840e78c27e62b254 100644
--- a/Source/core/html/imports/HTMLImportChild.cpp
+++ b/Source/core/html/imports/HTMLImportChild.cpp
@@ -42,13 +42,19 @@ namespace WebCore {
 
 HTMLImportChild::HTMLImportChild(Document& master, const KURL& url, SyncMode sync)
     : HTMLImport(sync)
+#if ENABLE(OILPAN)
+    , m_master(&master)
+#else
     , m_master(master)
+#endif
     , m_url(url)
     , m_customElementMicrotaskStep(0)
     , m_loader(0)
     , m_client(0)
 {
+#if !ENABLE(OILPAN)
     m_master.guardRef();
+#endif
 }
 
 HTMLImportChild::~HTMLImportChild()
@@ -65,7 +71,9 @@ HTMLImportChild::~HTMLImportChild()
     if (m_client)
         m_client->importChildWasDestroyed(this);
 
+#if !ENABLE(OILPAN)
     m_master.guardDeref();
+#endif
 }
 
 void HTMLImportChild::wasAlreadyLoaded()