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The test failure is due to NSApplication isn't set in
extensions::TestShellMainDelegate. This CL also did a clean up of CL:
https://crrev.com/c/1072387.

Bug: 853172
Change-Id: Id42649427b659a2b97cd0236e0d1d4d815ba4158
Reviewed-on: https://chromium-review.googlesource.com/1105194Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Xi Han <hanxi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568525}