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WorkerPool is being deprecated in favor of TaskScheduler.

NSS calls may acquire the NSS lock or reenter Chrome code via
extension hooks (such as smart card UI). To ensure threads are not
starved or deadlocked, base::ScopedBlockingCall instances
increment the thread pool capacity when too much time is spent
in a scope where an NSS call is made.

Bug: 659191
Change-Id: Iaf088d84521753a3399083047a4e5733d44c472f
Reviewed-on: https://chromium-review.googlesource.com/648218Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Commit-Queue: Francois Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501248}