Migrate MessageLoop::ScopedNestableTaskAllower to RunLoop::Type::kNestableTasksAllowed in /third_party/blink/renderer/platform/scheduler

This is another scripted pass done by a slightly modified version of
https://bugs.chromium.org/p/chromium/issues/detail?id=781352#c1 which
has a better notion of "scope".

The script should have replaced a MessageLoop::ScopedNestableTaskAllower
in the same scope as a RunLoop with a RunLoop of
Type::kNestableTasksAllowed.

Includes should have been stripped if that was the last usage of message_loop.h
in that file.

Please CQ if LGTY

This CL was uploaded by git cl split.

R=altimin@chromium.org

Bug: 781352
Change-Id: I471d4462277bf67332939a1cfce7f6f17d642cc7
Reviewed-on: https://chromium-review.googlesource.com/1013214
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551250}
2 files changed