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This reverts commit 87dac882.

Reason for revert: Breaks UMA recording.

Original change's description:
> Add full system profiles in .pma file as part of metrics init.
> 
> Prior to this change, only an incomplete system profile, notably
> missing field trials and uma_default_state fields, was stored
> at this point. So unclean shut downs after this point in time,
> but before the initial metrics log was saved would not include
> that info. This change fixes that by running the code that
> populates all the system profile fields.
> 
> Since we're now calling ProvideSystemProfileMetrics() twice, the
> logic in FieldTrialsProvider was no longer correct in tracking
> the log creation time. Instead, this CL updates the API to have
> that be passed in.
> 
> Additionally, Chrome OS an Screen Info providers needed updates since
> their dependencies are not yet available this early, so they are not
> able to provide all the information this early.
> 
> Finally, webview unit tests needed updating to init mojo as they are
> now exercising the provider code which has a Mojo dependency.
> 
> Bug: 992538
> TBR: sky@chromium.org
> Change-Id: Iae54398065470e390b70507d5b3ac09d5a983c9f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1746909
> Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
> Reviewed-by: Richard Coles <torne@chromium.org>
> Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
> Reviewed-by: Brian White <bcwhite@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#687000}

TBR=sky@chromium.org,rkaplow@chromium.org,asvitkine@chromium.org,torne@chromium.org,bcwhite@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 992538
Change-Id: I4a25324788960d2e61325c2a41812c5da18087f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1760869Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688146}