GitLab

Also changes ProvideStabilityMetrics() to take a SystemProfileProto* instead
of the stability section, since the plugin provider needs to inspect things
in the system profile when writing its stability data.

Also, cleans up some header includes.

BUG=374220
R=isherman@chromium.org, thestig@chromium.org
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/299783004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272462 0039d316-1c4b-4281-b951-d872f2087c98