[iOS][Translate] Renames translate_popup_menu_coordinator/mediator

Renames translate_popup_menu_coordinator and translate_popup_menu_mediator
to translate_infobar_coordinator and translate_infobar_mediator as they
have more responsiblities than only displaying/dismissing the translate
infobar popup menus, e.g., handling translate options notifications.

Bug: 910994
Change-Id: Id6e0df35ee8216b3d498ab407f58e08c4314ae40
Reviewed-on: https://chromium-review.googlesource.com/c/1436941
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Mark Cogan <marq@chromium.org>
Auto-Submit: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626110}
6 files changed