Use MessageLoopCurrent::IsSet in /components/policy

As stated in message_loop_current.h, |MessageLoopCurrent::IsSet()|
should be preferred to checking the return value of
|MessageLoopCurrent::Get()|.

Bug: 825327
Change-Id: I90bf74dd9929eeb946e8e2e3ee1ac2e9f093a938
Reviewed-on: https://chromium-review.googlesource.com/1025770
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553086}

CrOS-Libchrome-Original-Commit: 79805a381181211732387e28b7994bf4808c4739
1 file changed
tree: 0ce50df2a910f016a19d8a01313c266e31b2701c
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/