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Send both the updater and Chrome app ids in the "update apps" use case.
With this change, --install and --ua commands work as expected, meaning
the app ids and the versions are sent during update checks.

There is a edge case, not handled currently, where the app id for
the updater is not available until the first update check has happened.
This is going to be resolved in a future CL which lands as part of
fixing this CR bug.

R=waffles

Bug: 1020285
Change-Id: I2856a795ed61f590f85d792e4d5e1493bd23b84f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894833Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712315}