Remove inaccurate comment on powerful permissions

The logic has changed here:
https://chromium-review.googlesource.com/c/chromium/src/+/2038774

Bug: 888981
Change-Id: I02f4ca33477c3e6f3e77fd3021764b9ae96a99cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298003Reviewed-by: Aya Elsayed <ayaelattar@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Auto-Submit: Thiemo Nagel <tnagel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788552}

chrome/common/extensions/permissions/chrome_permission_message_rules.cc

@@ -336,10 +336,6 @@ ChromePermissionMessageRule::GetAllRules() {
   // system should allow us to design a system that is simple enough to explain
   // yet powerful enough to encapsulate all the messages we want to display.
   ChromePermissionMessageRule rules_arr[] = {
-      // BEGIN POWERFUL PERMISSIONS:
-      // The following permissions are shown in the chrome://management page.
-      // See also GetPowerfulPermissionMessages().
-
       // Full access permission messages.
       {IDS_EXTENSION_PROMPT_WARNING_DEBUGGER, {APIPermission::kDebugger}, {}},
       {IDS_EXTENSION_PROMPT_WARNING_FULL_ACCESS,
@@ -453,8 +449,6 @@ ChromePermissionMessageRule::GetAllRules() {
        {APIPermission::kPrintingMetrics},
        {}},
 
-      // END POWERFUL PERMISSIONS
-
       {IDS_EXTENSION_PROMPT_WARNING_DECLARATIVE_WEB_REQUEST,
        {APIPermission::kDeclarativeWebRequest},
        {}},