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use install_static in InitChannelInfo, SetEULAConsent, and
{Get,Set}ExperimentLables.

Also:
- changed EULA -> Eula in symbol names in chrome/installer.
- added support for testing both per-user and per-machine installs in
  GCAPIOmahaExperimentTest.

BUG=879568

Change-Id: I7676c7b75a9cb4cd3a85d1ba609d66a71581f05e
Reviewed-on: https://chromium-review.googlesource.com/1215024
Commit-Queue: Greg Thompson <grt@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590238}