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The tests were failing because on Chrome OS the desktop capture source
is named "Display", not "Entire screen".

Change-Id: I008f406557dd4bb6a55ab301b4bb1651e0726eca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517582Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824091}