Activate Legacy SameSite cookie enterprise policies

This removes "future: True" from the Legacy cookie access enterprise
policies to activate them, as the implementation is now complete.

Bug: 978172
Change-Id: I6f5073483b680532572113a58a44081ef211ef33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865593Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706649}

components/policy/resources/policy_templates.json

@@ -5477,7 +5477,6 @@
     },
     {
       'name': 'LegacySameSiteCookieBehaviorEnabled',
-      'future': True,
       'owners': [ 'chlily@chromium.org', ],
       'type': 'int-enum',
       'schema': {
@@ -5515,7 +5514,6 @@
     },
     {
       'name': 'LegacySameSiteCookieBehaviorEnabledForDomainList',
-      'future': True,
       'owners': [ 'chlily@chromium.org', ],
       'type': 'list',
       'schema': {