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This reverts commit 06578271.

Reason for revert: Getting reports of the version check not working from various users; see crbug.com/1115140

Original change's description:
> Rewrote PRESUBMIT.py
> 
> Rewrote PRESUBMIT.py (and associated tests) to new format. Runs
> REQUIRE_PRESUBMIT_VERSION at the top so that depot_tools can be
> made aware of the change and can time/rdb wrap each of the Check...
> functions separately, while also ensuring that they have the new
> version of depot_tools.
> 
> Requires the newer version of presubmit_support.py in depot_tools,
> which is described in crrev.com/c/2341828
> 
> Change-Id: I102e8c75834aff1eccdf4a27ffe6f0953b76ee57
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341362
> Reviewed-by: Dirk Pranke <dpranke@google.com>
> Commit-Queue: Saagar Sanghavi <saagarsanghavi@google.com>
> Cr-Commit-Position: refs/heads/master@{#796595}

TBR=dpranke@google.com,estaab@chromium.org,saagarsanghavi@google.com

Change-Id: Ib3295d141e997fc6792c381fea10e8892204bcdb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2349428Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#796867}