[Mac] Rename SuggestedTextTouchBar => TextSuggestionsTouchBar

The SuggestedTextTouchBarController was renamed to
TextSuggestionsTouchBarController. Any instances of
SuggestedTextTouchBarController were updated to the new name.

The following were also changed:
  - File names were modified as follows:
    */{suggested_text => text_suggestions}_*
  - BUILD files were updated to reflect the new file names
  - Tests of the TouchBarController were renamed
  - Flags relating to the TouchBarController were renamed

Bug: 717553
Change-Id: Ie2749ed0942362c7e89fd924441b4eac9397ce53
Reviewed-on: https://chromium-review.googlesource.com/1162895
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Tessa Nijssen <tnijssen@google.com>
Cr-Commit-Position: refs/heads/master@{#580985}
14 files changed