Revert "[Mac] Replace Editing Word with Selected Suggestion from Touch Bar"

This reverts commit 147c8df597ce25c86e46a7a766229732bda10e63.

Reason for revert: Test failure, see crbug.com/861893

Original change's description:
> [Mac] Replace Editing Word with Selected Suggestion from Touch Bar
> 
> WebContents::Replace() replaces the current text selection with a given
> string. Currently, SuggestedTextTouchBarController replaces the
> current user selection when a suggestion is chosen from the touch bar.
> 
> SuggestedTextTouchBarController now calculates a range that
> encompasses the word in which the cursor resides. If the cursor is not
> in or at the end of a word, the range representing the editing word
> starts at the cursor position and has length 0.
> 
> When a suggestion is chosen from the touch bar, the selection within
> the textfield is modified to encompass the word currently being
> edited (which may be only a cursor position) and then
> WebContents::Replace() is called to replace the selection.
> 
> A unit test was written to test that
> editingWordFromText:cursorPosition: properly calculates the range
> encompassing the current editing word for various combinations of word
> and non-word characters.
> 
> Bug: 717553
> Change-Id: I4fe1fbaf2e19f8b33177e07789dca3a30bb7d88e
> Reviewed-on: https://chromium-review.googlesource.com/1123226
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Reviewed-by: Sarah Chan <spqchan@chromium.org>
> Commit-Queue: Tessa Nijssen <tnijssen@google.com>
> Cr-Commit-Position: refs/heads/master@{#573362}

TBR=avi@chromium.org,spqchan@chromium.org,tnijssen@google.com

Change-Id: I8e79b608aab37f7fda5e09f6fbd3d16c0d19a384
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 717553
Reviewed-on: https://chromium-review.googlesource.com/1130120
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573459}
4 files changed