GitLab

This reverts commit 1e874ff9.

Reason for revert: This appears to be causing many UKM related tests to fail in official builds:
https://uberchromegw.corp.google.com/i/official.desktop.continuous/builders/win%20trunk/builds/86186

Original change's description:
> Create fallback config for UKM sampling.
> 
> Some clients do not have the sampling configuration for UKM records
> and the large number of entries can cause significant bias when weighted
> against those clients that are sampling.  Setting a large default
> sampling value will at least bias the other way.
> 
> Bug: 766909
> Change-Id: Ib6d656bd2ce4d82efb35281d09dc7b94128fadb2
> Reviewed-on: https://chromium-review.googlesource.com/1095596
> Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
> Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
> Commit-Queue: Brian White <bcwhite@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#566831}

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

Change-Id: I85b86053a3a41add9a5c93e31006b885b3b2f3d3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 766909
Reviewed-on: https://chromium-review.googlesource.com/1099617Reviewed-by: Reid Kleckner <rnk@chromium.org>
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566968}