Oilpan: have WebPerformance use transition types.

public/web/WebPerformance.h

Index: public/web/WebPerformance.h
diff --git a/public/web/WebPerformance.h b/public/web/WebPerformance.h
index 99d973a8953e4f6c8d51939ea3196cf45b7e7bdc..2d1be2924e142a38387b953c57aadb6c297c0a7f 100644
--- a/public/web/WebPerformance.h
+++ b/public/web/WebPerformance.h
@@ -35,6 +35,10 @@
 #include "../platform/WebPrivatePtr.h"
 #include "WebNavigationType.h"
 
+#if BLINK_IMPLEMENTATION
+#include "heap/Handle.h"
+#endif
+
 namespace WebCore { class Performance; }
 
 namespace blink {
@@ -82,9 +86,8 @@ public:
     BLINK_EXPORT double loadEventEnd() const;
 
 #if BLINK_IMPLEMENTATION
-    WebPerformance(const WTF::PassRefPtr<WebCore::Performance>&);
-    WebPerformance& operator=(const WTF::PassRefPtr<WebCore::Performance>&);
-    operator WTF::PassRefPtr<WebCore::Performance>() const;
+    WebPerformance(const PassRefPtrWillBeRawPtr<WebCore::Performance>&);
+    WebPerformance& operator=(const PassRefPtrWillBeRawPtr<WebCore::Performance>&);
 #endif
 
 private: