Remove TosDialogBehavior value 0 to make documentation more clear.

BYPASS_POLICY_COMPATIBILITY_CHECK=Marking value 0 as deprecated would
not be as clear. 0 will still continue to be handled the same as it was
previously.

Bug: 1159662
Change-Id: Id179a043a37b844fa54afa44ff87aeb44b3633c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626984Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843646}

components/policy/resources/policy_templates.json

@@ -23616,14 +23616,9 @@ If you disable this policy, web page scrolling to specific text fragments via UR
       'type': 'int-enum',
       'schema': {
         'type': 'integer',
-        'enum': [ 0, 1, 2],
+        'enum': [ 1, 2],
       },
       'items': [
-        {
-          'name': 'Unset',
-          'value': 0,
-          'caption': '''Use default browser behavior, shows the ToS and waits for the user to accept.''',
-        },
         {
           'name': 'StandardTosDialog',
           'value': 1,