Remove obsolete comment about resource identifiers in content settings

Change-Id: I8e0e3b0968358bdda8e43a4afcc98712c7f3dd93
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3412120
Auto-Submit: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/main@{#962941}

components/content_settings/core/common/content_settings_pattern.cc

@@ -367,8 +367,6 @@ operator=(PatternParts&& other) = default;
 //   - a.b.c.d (matches an exact IPv4 ip)
 //   - [a:b:c:d:e:f:g:h] (matches an exact IPv6 ip)
 //   - file:///tmp/test.html (a complete URL without a host)
-// Version 2 adds a resource identifier for plugins.
-// TODO(jochen): update once this feature is no longer behind a flag.
 const int ContentSettingsPattern::kContentSettingsPatternVersion = 1;
 
 // static