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As this is not a part of the specification https://w3c.github.io/webappsec/specs/credentialmanagement/#credentialcontainer

This patch is a part of a two-sided patchset:
Blink: https://codereview.chromium.org/1217463002/ <-- this patch
Chromium: https://codereview.chromium.org/1215653003/

BUG=494880

Review URL: https://codereview.chromium.org/1217463002

git-svn-id: svn://svn.chromium.org/blink/trunk@197981 bbb929c8-8fbe-4397-9dbb-9b2b20218538