Trim Android and iOS directories from omnibox watch list.

I'm the only person who currently uses this list and I've been ignoring
CLs in these directories unless they touch any of the other omnibox
directories.

Change-Id: Id85e3e5fa525a151823a353666dbe2571c4a6835
Reviewed-on: https://chromium-review.googlesource.com/c/1293169Reviewed-by: Kevin Bailey <krb@chromium.org>
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601573}

WATCHLISTS

@@ -1280,15 +1280,12 @@
                   '|chrome/android/java/src/org/chromium/chrome/browser/offlinepages/'
     },
     'omnibox': {
-      'filepath': 'chrome/android/java/src/org/chromium/chrome/browser/omnibox/|'\
-                  'chrome/android/javatests/src/org/chromium/chrome/browser/omnibox/|'\
-                  'chrome/browser/autocomplete/|'\
+      'filepath': 'chrome/browser/autocomplete/|'\
                   'chrome/browser/ui/location_bar/|'\
                   'chrome/browser/ui/omnibox/|'\
                   'chrome/browser/ui/.*/location_bar/|'\
                   'chrome/browser/ui/.*/omnibox/|'\
-                  'components/omnibox/|'\
-                  'ios/chrome/browser/ui/omnibox/'
+                  'components/omnibox/'
     },
     'optimization_guide': {
       'filepath': 'optimization_guide|'\