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This CL is part of the effort to unify the LazyBackgroundTaskQueue and the ServiceWorkerTaskQueue.

Bug: 915814
TBR: dmazzoni@chromium.org (Removed a header file in accessibility_extension_api.cc)
Change-Id: I067bc70b4ed047a0466d70b7d976e01806e7bf98
Reviewed-on: https://chromium-review.googlesource.com/c/1404577
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Anand Mistry <amistry@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622127}