When we can't neuter ArrayBuffers, we can't transfer them

Instead, we need to copy

BUG=603987
R=haraken@chromium.org

Review URL: https://codereview.chromium.org/1904913002

Cr-Commit-Position: refs/heads/master@{#388719}
bool SerializedScriptValue::containsTransferableArrayBuffer() const
{
    return m_arrayBufferContentsArray && !m_arrayBufferContentsArray->isEmpty();
}

bool SerializedScriptValue::containsTransferableArrayBuffer() const
{
    return m_arrayBufferContentsArray && !m_arrayBufferContentsArray->isEmpty();
}
