Pausable Object Cleanup - Workers

Remove the paused_calls vector on WorkerGlobalScope because all
the calls executed occur on pausable task queues after
http://crrev.com/1eb2d22.

BUG=907125

Change-Id: I42ad827eb1131f643158f9c6e565d69886896ccc
Reviewed-on: https://chromium-review.googlesource.com/c/1385015
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618379}
9 files changed