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After app unexpectedly crashes in EG2 test, it is relaunched at -setUp
of next testMethod. Currently in this situation, |appNeedsLaunching| is
judged false and app is launched without TestCase +setUps at |activate|
method, which will cause DCHECK failures at +tearDown. This change makes
|appNeedsLaunching| judged true in this situation and run TestCase
+setUps after the relaunch to prevent DCHECK failures.

Bug: 1023911
Change-Id: I83bd06df7afdf2402fbb0593a6825910107534f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037852Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739118}