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Users with BrowserThread traits can just use the getter to get a new
pointer to the existing task runner each time (the BrowserThread API
will soon move to content::GetUIThreadTaskRunner() and this call will
make even more sense then the current one using "create" semantics).

This is necessary in order to rename LazyTaskRunner to
LazyThreadPoolTaskRunner and having it automatically call into the
upcoming base::ThreadPool:: APIs (destination as an API rather than as
a trait).

See Task Posting APIs v3 for details:
https://docs.google.com/document/d/1tssusPykvx3g0gvbvU4HxGyn3MjJlIylnsH13-Tv6s4/edit

R=fdoray@chromium.org

Bug: 1026641
Change-Id: I03e84ad5f607c93c4e2d649820954f0a4b08df56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1988682
Auto-Submit: Gabriel Charette <gab@chromium.org>
Reviewed-by: Patrick Monette <pmonette@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729940}