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We decided to share a single language list between OS and browser, and
to show the list in both settings pages. For consistency between the
two UI surfaces, we're keeping the "Display Chrome OS in this language"
item in both places.

This CL eliminates pageVisibility.uiDisplayedInThisLanguage because it
would always be true.

Bug: 974424, 982299
Test: manual, menu item appears in browser settings after flag flip
Change-Id: Icc0bf8a344038bcc73059e74e5fdab9c88306cbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693388
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: May Lippert <maybelle@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676177}