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Now that the web font timing issue for WPT in Blink has been fixed
(https://crbug.com/507054), these tests should no longer be flaky.

Update FlagExpectations/disable-blink-features=RootLayerScrolling to
match TestExpectations:
1. The three lines associated with crbug.com/553838 are removed in
   https://crrev.com/c/954044
2. The other lines associated with crbug.com/582836 are removed in
   https://crrev.com/c/962704

Bug: 582836, 507054
Change-Id: I8073e7ca86046a437b67e92a7e552e1666cd5983
Reviewed-on: https://chromium-review.googlesource.com/962705
Commit-Queue: Robert Ma <robertma@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543100}