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This change is related to the TaskScheduler cleanup work.
PolicyWatcher::Create was tagged to have BrowserThread::FILE removed,
however it was only mentioned in the comments.  This comment could
have been removed, but I wanted to update the method names / params
to make the PolicyWatcher initialization mechanism more obvious.

This change splits the Create() method into two methods and updates
the callsites.  I wanted to keep a single, private Create method to
keep the per-OS creation logic intact.


Bug: 
Change-Id: Ie4b4788a4d313414819b31ab5e1fca77781d1df3
Reviewed-on: https://chromium-review.googlesource.com/572442Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487361}