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Google Update and Chrome use Chrome's ClientState key as a bucket for
holding data and to communicate with one another. In general, HKLM is
used for system-level installs and HKCU is used for per-user
installs. GoogleUpdateSettings was looking in both hives for values,
which can lead to incorrect values being used. This CL tightens up
accesses so that only the correct hive is used for each value.

This CL also updates some of the implementation to use install_static
instead of BrowserDistribution, which is deprecated.

Finally, some dead code has been removed.

BUG=none
R=rogerta@chromium.org

Change-Id: I0d70042e2d70d9d33e9eb8c2f5e846e35d5d0634
Reviewed-on: https://chromium-review.googlesource.com/1179743Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584046}