DO NOT MERGE Fix a unit test for adb logcat in AndroidDevice.

Bug=27704949

This is a cherry-pick of https://partner-android-review.googlesource.com/#/c/557123/
Change-Id: I7f123aad8c53fb9cf2d82406f7ed38d8e70a94ad
1 file changed
tree: 07b341fbf0f5db66d1afd14ef3251cdf115e6532
  1. acts/