service worker/navigation: Fix pre-PlzNavigate comment about provider id.

The comment is obsolete. "current architecture" meant pre-PlzNavigate.

Bug: 789577
Change-Id: Ib53714275a7f54503e415f3a1986cb2f498dd37d
Reviewed-on: https://chromium-review.googlesource.com/1156184
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579708}

content/common/navigation_params.h

@@ -279,7 +279,6 @@ struct CONTENT_EXPORT RequestNavigationParams {
   // navigation commits.
   bool should_clear_history_list = false;
 
-  // PlzNavigate
   // Whether a ServiceWorkerProviderHost should be created for the window.
   bool should_create_service_worker = false;
 
@@ -287,11 +286,8 @@ struct CONTENT_EXPORT RequestNavigationParams {
   // Timing of navigation events.
   NavigationTiming navigation_timing;
 
-  // PlzNavigate
   // The ServiceWorkerProviderHost ID used for navigations, if it was already
   // created by the browser. Set to kInvalidServiceWorkerProviderId otherwise.
-  // This parameter is not used in the current navigation architecture, where
-  // it will always be equal to kInvalidServiceWorkerProviderId.
   int service_worker_provider_id = kInvalidServiceWorkerProviderId;
 
   // PlzNavigate