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The flakiness only occurs on ASan builds. The test times out because the
shim does not successfully launch when the app launches.
LSOpenApplication returns procNotFound(-600). It's not clear why this
happens, but it could be some interaction with WaitForSingleProcess.

Reversing the order of the two test cases fixes the flakiness.

BUG=415422

Review URL: https://codereview.chromium.org/597113003

Cr-Commit-Position: refs/heads/master@{#296389}