[iOS][Translate] Fixes bugs with new translate infobar auto-never translate

1. Denied count was being incremented via
   TranslateInfoBarDelegate::InfoBarDismissed before the check for auto
   never translate which resulted in fewer tries needed to activate it.
2. Infobar was not being dismissed if the user pressed "Undo" on the auto
   never translate notification snackbar.

TBR=anthonyvd@

Bug: 943553,910994
Change-Id: I7692f5ea5b7ca8b0abbefcefb4a451821b4d7583
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529178
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Auto-Submit: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642006}
1 file changed