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When an Omnibox line goes to state button-selected, we called
OnTemporaryTextMaybeChanged(). We did this because it happened to
call SetAccessibilityLabel() and wasn't harmful in the general case.
But it turns out to be harmful in some corner RTL cases, so this
narrows it to solely the accessibility call.

This required adding a sibling virtual method to OnTemporary...()
of OmniboxView::SetAccessibilityLabel(). This only affects desktop
platforms.

Change-Id: If09b6870415522ce69caaf746186b7867611b7da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895967Reviewed-by: manuk hovanesian <manukh@chromium.org>
Commit-Queue: Kevin Bailey <krb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712262}