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This reverts commit 5c5ce638.

Reason for revert: broke the build

Original change's description:
> Make histograms/pretty_print_test.py run on the bots.
> 
> This test was added via:
> https://chromium-review.googlesource.com/1244553
> 
> This is a follow-up CL to add it to metrics_python_tests so
> that it will run on the bots.
> 
> Renames Python files to avoid name collisions between
> different scripts, so that they can run together as part of
> metrics_python_tests. Also fixes up the rappor model test
> and adds it to the suite.
> 
> Bug: 714123
> Change-Id: I466584493f7090decdb8b21217347a905b3e6391
> Reviewed-on: https://chromium-review.googlesource.com/c/1255596
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#596921}

TBR=dpranke@chromium.org,asvitkine@chromium.org,holte@chromium.org

Change-Id: Iebebe68f9c4c4da11e6e79fc14b9853bea737e5c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 714123
Reviewed-on: https://chromium-review.googlesource.com/c/1263434Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596931}