Project health: remove flaky asserts in ThreadTest.
Project health: remove flaky asserts in ThreadTest.

	Change on 2019/03/04 by antoniocortes <antoniocortes@google.com>

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=236706177

life-beam/j2objc,mirego/j2objc,mirego/j2objc,groschovskiy/j2objc,groschovskiy/j2objc,life-beam/j2objc,lukhnos/j2objc,life-beam/j2objc,lukhnos/j2objc,google/j2objc,groschovskiy/j2objc,life-beam/j2objc,groschovskiy/j2objc,google/j2objc,mirego/j2objc,google/j2objc,mirego/j2objc,lukhnos/j2objc,lukhnos/j2objc,google/j2objc,lukhnos/j2objc,groschovskiy/j2objc,mirego/j2objc,life-beam/j2objc,google/j2objc,mirego/j2objc,lukhnos/j2objc,life-beam/j2objc,google/j2objc,groschovskiy/j2objc