Port ef49c6b1

Original commit message:

    Default (and only way) is now to retrieve a tagged object.

R=mlippautz@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=chromium:606711
LOG=N

Review-Url: https://codereview.chromium.org/1917353002
Cr-Commit-Position: refs/heads/master@{#35829}