Adding flag android.webkit.file_system_access to trunk_staging.

This change was automatically created by advancing the Gantry workflow at:
https://releasetracker.partner.android.com/changes/1801lri000001?build_unique_id=AndroidWebkitFileSystemAccessLaunch-platform
Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag.

Bug: 40101963
Change-Id: I644599c4038b1b376fbd89c368be33f4af432627
Flag: android.webkit.file_system_access
Ignore-AOSP-First: AConfig change for future AOSP release
1 file changed