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arv authored
When setting a property using `super.prop = val` we need to use add property if we are adding a new property and not set property. BUG=493566 LOG=N R=verwaest@chromium.org, dslomov@chromium.org Review URL: https://codereview.chromium.org/1161073002 Cr-Commit-Position: refs/heads/master@{#28971}
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