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This prevents the --install process from exiting before the global
service is actually available. Additionally, since we are going to call
UpdateService to update the app registration anyways, this is the
appropriate time to wait until its there.

Bug: 1131654
Change-Id: Ifff75fafdf71a46877e9918bc26a40961703b86d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441283
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813275}