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scheduler: Replace kInternalAccessibility with kInternalDefault and deprectate kInternalAccessibility

Following the guideline https://bit.ly/2vMAsQ4, we determined to use
kInternalDefault as long as the tasks can run in the default way, that
might be throttled or paused. This CL deprecates kInternalAccessibility
whose task runner is a default task runner.

Bug: 836410
Change-Id: Icaa3532e3ef2563b8baa6436566cc5f1ac036b86
Reviewed-on: https://chromium-review.googlesource.com/1032318
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557109}