Oilpan: move FetchBodyStream to the heap.

Source/modules/serviceworkers/FetchBodyStream.h

Index: Source/modules/serviceworkers/FetchBodyStream.h
diff --git a/Source/modules/serviceworkers/FetchBodyStream.h b/Source/modules/serviceworkers/FetchBodyStream.h
index ff2101779e6dd95be152341ee7e001bf6d6e7ac3..08773466aafa60c86756c4f7071b81096214ad7a 100644
--- a/Source/modules/serviceworkers/FetchBodyStream.h
+++ b/Source/modules/serviceworkers/FetchBodyStream.h
@@ -12,6 +12,7 @@
 #include "core/fileapi/FileReaderLoader.h"
 #include "core/fileapi/FileReaderLoaderClient.h"
 #include "platform/blob/BlobData.h"
+#include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
@@ -19,9 +20,12 @@ namespace WebCore {
 
 class ScriptState;
 
-class FetchBodyStream
-    : public ScriptWrappable
-    , public RefCounted<FetchBodyStream>
+// FIXME: Oilpan: when the implementation stops using
+// ActiveDOMObject::(un)setPendingActivity, derive from
+// RefCountedWillBeGarbageCollectedFinalized instead.
+class FetchBodyStream FINAL
+    : public RefCountedWillBeRefCountedGarbageCollected<FetchBodyStream>
+    , public ScriptWrappable
     , public ActiveDOMObject
     , public FileReaderLoaderClient {
 public:
@@ -33,7 +37,7 @@ public:
         ResponseAsText
     };
 
-    static PassRefPtr<FetchBodyStream> create(ExecutionContext*, PassRefPtr<BlobDataHandle>);
+    static PassRefPtrWillBeRawPtr<FetchBodyStream> create(ExecutionContext*, PassRefPtr<BlobDataHandle>);
     ~FetchBodyStream() { }
 
     ScriptPromise asArrayBuffer(ScriptState*);
@@ -45,6 +49,8 @@ public:
     // ActiveDOMObject override.
     virtual void stop() OVERRIDE;
 
+    void trace(Visitor*) { }
+
 private:
     FetchBodyStream(ExecutionContext*, PassRefPtr<BlobDataHandle>);
     ScriptPromise readAsync(ScriptState*, ResponseType);