VS2015 bots fail due to CallbackPromiseAdapter change[1]. This CL fixes the issue without changing the behavior.
VS2015 bots fail due to CallbackPromiseAdapter change[1]. This CL
fixes the issue without changing the behavior.

1: https://src.chromium.org/viewvc/blink?view=rev&revision=200234
BUG=493531, 440500

Review URL: https://codereview.chromium.org/1290043002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@200551 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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