Move TextPaintTimingDetectorTest to TestMockTimeTaskRunner

In this CL TextPaintTimingDetectorTest is moved out of time function overrides.
TestMockTimeTaskRunner is used instead.

Bug: 919383
Change-Id: I11d4f524787f6e948509f3e57f3032ce7724cc8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623085
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Sergio Villar <svillar@igalia.com>
Cr-Commit-Position: refs/heads/master@{#661859}
1 file changed