Update Language Detection and Translate to support isolated world

To prepare for moving these features to an isolated world, update
access of WebFramesManagers to always get the appropriate manager.

This will currently have no change on the existing call sites as the
same WebFramesManager and frames will be used.

Bug: 1380918
Change-Id: I4d6fa17d408f8248aab3ad68099a08aabc7a11ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4331957


Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Anthony Cui <cuianthony@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1118894}