[blink] Make sure that we use non-negative delay when moving old timers

- Do not attempt to post a task with negative delay when moving outdated timer
  to a new task runner.

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Review-Url: https://codereview.chromium.org/2567383004
Cr-Commit-Position: refs/heads/master@{#438813}
1 file changed