[Extensions] Restrict match_origin_as_fallback to Manifest V3 The `match_origin_as_fallback` key for content scripts is only supported in Manifest V3. Properly ignore and error if a lower manifest version is supplied. Bug: 55084 Change-Id: I6031c020c04c44e75e5c2859892c8ff87da3c38b Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3353969 Reviewed-by: Kelvin Jiang <kelvinjiang@chromium.org> Commit-Queue: Devlin Cronin <rdevlin.cronin@chromium.org> Cr-Commit-Position: refs/heads/main@{#954522}
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