Revert of Move DOMArrayBuffer, DOMArrayBufferViews and DataView to the heap.

third_party/WebKit/Source/modules/encryptedmedia/MediaKeyStatusMap.cpp

 // 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.
 
 #include "modules/encryptedmedia/MediaKeyStatusMap.h"
 
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/DOMArrayPiece.h"
 #include "public/platform/WebData.h"
 #include "wtf/text/WTFString.h"
@@ skipping 41 matching lines @@
             std::min(a->keyId()->byteLength(), b->keyId()->byteLength()));
         if (result != 0)
             return result < 0;
 
         // KeyIds are equal to the shared length, so the shorter string is <.
         return a->keyId()->byteLength() <= b->keyId()->byteLength();
     }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
-        visitor->trace(m_keyId);
     }
 
 private:
     MapEntry(WebData keyId, const String& status)
         : m_keyId(DOMArrayBuffer::create(keyId.data(), keyId.size()))
         , m_status(status)
     {
     }
 
-    const Member<DOMArrayBuffer> m_keyId;
+    RefPtr<DOMArrayBuffer> m_keyId;
     const String m_status;
 };
 
 // Represents an Iterator that loops through the set of MapEntrys.
 class MapIterationSource final : public PairIterable<ArrayBufferOrArrayBufferView, String>::IterationSource {
 public:
     MapIterationSource(MediaKeyStatusMap* map)
         : m_map(map)
         , m_current(0)
     {
@@ skipping 74 matching lines @@
     }
     return false;
 }
 
 DEFINE_TRACE(MediaKeyStatusMap)
 {
     visitor->trace(m_entries);
 }
 
 } // namespace blink