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This CL does a minor clean up for TileManagerTest.

Bug: 1078163
Change-Id: I453c8aab836ad09a5cb97f360cee16d379f695cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212514Reviewed-by: Hesen Zhang <hesen@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771875}