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On desktop, if the page has already been translated then the manual translate option in the context menu is disabled. Instead, keep the option enabled, and when selected re-surface the translate bubble UI without triggering a new translation.
On Android, the menu option is enabled but does not perform any function. Instead, follow the same strategy and re-surface the UI without a new translation.

Bug: 1024514
Change-Id: Ide42c3deead6ca5839ff03daff1c790084759a4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622383Reviewed-by: Megan Jablonski <megjablon@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Anthony Cui <cuianthony@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843674}