[iOS][Translate] Support multiline labels in translate infobar popup menus

- Adds support for multiline labels in the translate infobar popup menus.
- Uses a checkmark icon instead of the UITableViewCellAccessoryCheckmark to
  indicated if a row is selected. Using the cell's accessoryType along with
  multiline labels has some drabacks including not being able to reserve
  space for the checkmark accessory as well as the cells being taller than
  they need to be.

Bug: 910994
Change-Id: Iaefa7597011bd50b281a6c0acea17a207134bb4f
Reviewed-on: https://chromium-review.googlesource.com/c/1418733
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Auto-Submit: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624179}
8 files changed