WATCHLISTS: Update path to CrOS IME extension API.

Things were moved approx 8 years ago: https://crrev.com/10735074.

Change-Id: I14829a47fb7221310fb54f24e1dec96b9a1118dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2230435Reviewed-by: Darren Shen <shend@chromium.org>
Auto-Submit: Bao-Duy Tran <tranbaoduy@chromium.org>
Commit-Queue: Bao-Duy Tran <tranbaoduy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#777284}

WATCHLISTS

@@ -1828,7 +1828,7 @@
       'filepath': 'chrome/browser/chromeos/input_method/'\
                   '|chrome/browser/chromeos/extensions/input_method'\
                   '|chrome/browser/chromeos/status/input_method'\
-                  '|chrome/browser/extensions/extension_input_'\
+                  '|chrome/browser/extensions/api/input_ime'\
                   '|chrome/browser/resources/keyboard'\
                   'chromeos/.*(language|keyboard)'\
                   '|chromeos/ime/*'