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This reverts commit 4eeae7ba and adds
the pyobjc wheel to Chromium's root .vpython. At this point, vpython
is used on all of the bots for the system Python, so it should be
suitably warmed up before getting into any of Chromium's tests.

Bug: 776804, 804174
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I35c602ca6e0368532685ae8afc3139692a6153fa
Reviewed-on: https://chromium-review.googlesource.com/954704Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541740}