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It is not needed for correctness, and it has overhead. Work is generally
already flushed in TileManager::FlushAndIssueSignals.

Bug: 836497
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I53156defe40fe0818ca05f8cfc2cf8d5faf99e02
Reviewed-on: https://chromium-review.googlesource.com/1035919Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554888}