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It assumes a specific ordering between immediate and delayed tasks that is
not guaranteed by the SequencedTaskRunner API which only states that :

//   - Given two tasks T2 and T1, T2 will start after T1 starts if:
//
//       * T2 is posted after T1; and
//       * T2 has equal or higher delay than T1; and
//       * T2 is non-nestable or T1 is nestable.

This property is already verified by
MessageLoopTypedTest.PostDelayedTask_InPostOrder_3 and recursive post task
ordering is verified by MessageLoopTypedTest.RecursiveDenial1.

R=gab@chromium.org
BUG=891670

Change-Id: Ic340df17dcd3529565564dff3c18c64f48bd1d2d
Reviewed-on: https://chromium-review.googlesource.com/c/1333772Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607612}