Also redirect stderr from the browser since Chrome recently started using it too
Also redirect stderr from the browser since Chrome recently started using it too

Example stderr output from Chrome:

  [24599:24650:0306/123817.372418:ERROR:browser_process_sub_thread.cc(209)]
  Waited 3 ms for network service

R=ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org

Change-Id: Idb71c9f3a2c735ee49b886896f55bdede559137c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1505792
Reviewed-by: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>
Commit-Queue: Sergiy Belozorov <aadb4a11584aa9878242ea5d9e4b7e3429654579@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools