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This resolves an race condition when an App is session restored, and its
file handling is being force enabled.

FileHandlingExpiry service involves IPC calls, whose replies are
received after ForceEnableFileHandlingOriginTrial. This causes
FileHandlerManager to disable the App's file handling, if the App does
not hold a valid origin trial token (even though File Handling was force
enabled, and should not require a origin trial token).

Fixed: 1064814
Change-Id: I294070a5cac4645784ff1d773c6f7845772b45b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2143773
Commit-Queue: Jiewei Qian  <qjw@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758756}