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We already don't save "Never translate <website>". We want the same behavior for
"Never translate <language>" in order to be consistent. Additionally, the
"Always translate" button doesn't work in incognito mode.

1. Remove the "Always translate <language>" button in incognito mode, on desktop
   and Android.

2. Don't persist "Never translate <language>" if clicked in incognito mode, but
   still apply it to the current session.

Needs more work to update the iOS UI.

Bug: 793925
Change-Id: I53f9bbd8dbcf605ef0682bf993b2835ab0ba92aa
Reviewed-on: https://chromium-review.googlesource.com/1115204Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Hajime Hoshi <hajimehoshi@chromium.org>
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571183}