Clarify which "mojom" is intended for LifecycleUnitDiscardReason

There is an ::extensions::mojom namespace so if you inside
extensions write just "mojom" it may (depending on what the compiler
knows) end up being resolved wrong.

Better would be if there was no ::mojom namespace so that there
could be no confusion.

Introduced in https://chromium-review.googlesource.com/c/1455472

Change-Id: I19c5a7a6da63db2da8e18c718185ff6769d4f939
Reviewed-on: https://chromium-review.googlesource.com/c/1472610
Commit-Queue: Daniel Bratell <bratell@opera.com>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632170}
2 files changed