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This reverts commit 91d6b1a9.

Reason for revert: Suspecting this CL for closing the tree
Unfortunately the compile error log is not very descriptive
https://ci.chromium.org/p/chromium/builders/ci/win32-archive-rel/15804?

Original change's description:
> Add histograms_index file to record all available histograms xmls
> 
> This histograms_index file provides a convenient way for a job to know
> all of the histogram files without having to search for them. As we
> split up histograms, we need a way to locate all available histograms
> xmls and thus we need this index file.
> 
> This cl also adds a PRESUBMIT check to make sure this index file is
> up-to-date.
> 
> Bug: 1116807
> Change-Id: Ifc55e421092448b5cecaa573f02e651a098428bf
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359234
> Reviewed-by: Steven Holte <holte@chromium.org>
> Reviewed-by: Brian White <bcwhite@chromium.org>
> Commit-Queue: Weilun Shi <sweilun@chromium.org>
> Auto-Submit: Weilun Shi <sweilun@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#800357}

TBR=bcwhite@chromium.org,holte@chromium.org,sweilun@chromium.org

Change-Id: Ia072d6f1f0bc23e73f9281631659ba1f6d52bb12
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1116807
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368416Reviewed-by: Charlene Yan <cyan@chromium.org>
Commit-Queue: Charlene Yan <cyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800369}