Oilpan: have DOMException be on the heap by default.

Source/modules/fetch/BodyStreamBuffer.h

Index: Source/modules/fetch/BodyStreamBuffer.h
diff --git a/Source/modules/fetch/BodyStreamBuffer.h b/Source/modules/fetch/BodyStreamBuffer.h
index b14a36f84cc68502de6e9a240a887605a1f625c1..f7d37a16f7d5640feaba7785dd73257f32a98b8f 100644
--- a/Source/modules/fetch/BodyStreamBuffer.h
+++ b/Source/modules/fetch/BodyStreamBuffer.h
@@ -38,7 +38,7 @@ public:
     public:
         virtual ~BlobHandleCreatorClient() { }
         virtual void didCreateBlobHandle(PassRefPtr<BlobDataHandle>) = 0;
-        virtual void didFail(PassRefPtrWillBeRawPtr<DOMException>) = 0;
+        virtual void didFail(DOMException*) = 0;
         DEFINE_INLINE_VIRTUAL_TRACE() { }
     };
     explicit BodyStreamBuffer(Canceller*);
@@ -47,14 +47,14 @@ public:
     PassRefPtr<DOMArrayBuffer> read();
     bool isClosed() const { return m_isClosed; }
     bool hasError() const { return m_exception; }
-    PassRefPtrWillBeRawPtr<DOMException> exception() const { return m_exception; }
+    DOMException* exception() const { return m_exception; }
 
     // Can't call after close() or error() was called.
     void write(PassRefPtr<DOMArrayBuffer>);
     // Can't call after close() or error() was called.
     void close();
     // Can't call after close() or error() was called.
-    void error(PassRefPtrWillBeRawPtr<DOMException>);
+    void error(DOMException*);
     void cancel() { m_canceller->cancel(); }
 
     // This function registers an observer so it fails and returns false when an
@@ -74,7 +74,7 @@ public:
 private:
     Deque<RefPtr<DOMArrayBuffer>> m_queue;
     bool m_isClosed;
-    RefPtrWillBeMember<DOMException> m_exception;
+    Member<DOMException> m_exception;
     Member<Observer> m_observer;
     Member<Canceller> m_canceller;
 };