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Currently, when a bot runs a test (say, url_unittests) on an
Android build, it'll launch `python test_env.py logdog_wrapper.py
bin/run_url_unittests` (roughly speaking).

This CL flips that around so that the generated bin/run_url_unittests
script will invoke test_env.py to launch url_unittests (and the bot
will then invoke bin/run_url_unittests directly).

This slightly reduces the discrepancy between what a dev runs locally
and what the bot runs, and will make Android consistent with every other
platform.

Bug: 816629
Change-Id: I76727641b5a4362f37762ed4ed4b175eea58ce2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506634Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#822042}