CallbackPromiseAdapter types should be more compatible with WebCallbacks (1/3).

Source/modules/bluetooth/ConvertWebVectorToArrayBuffer.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ConvertWebVectorToArrayBuffer_h
 #define ConvertWebVectorToArrayBuffer_h
 
 #include "core/dom/DOMArrayBuffer.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebVector.h"
+#include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class ScriptPromiseResolver;
 
 // ConvertWebVectorToArrayBuffer is used with CallbackPromiseAdapter to receive
 // WebVector responses. See CallbackPromiseAdapter class comments.
 class ConvertWebVectorToArrayBuffer {
     WTF_MAKE_NONCOPYABLE(ConvertWebVectorToArrayBuffer);
 public:
     // Interface required by CallbackPromiseAdapter:
-    typedef WebVector<uint8_t> WebType;
+    using WebType = OwnPtr<WebVector<uint8_t>>;
     static PassRefPtr<DOMArrayBuffer> take(ScriptPromiseResolver*, PassOwnPtr<WebVector<uint8_t>>);
 
 private:
     ConvertWebVectorToArrayBuffer() = delete;
 };
 
 } // namespace blink
 
 #endif // ConvertWebVectorToArrayBuffer_h