WebRTC: Update source-of-truth for 'git-cl'
WebRTC: Update source-of-truth for 'git-cl'

Bug: 751635
Change-Id: I503dc5d108c314ef617af2e46e937bc63cd087b9
Reviewed-on: https://chromium-review.googlesource.com/660703
Reviewed-by: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@chromium.org>
Commit-Queue: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools