[omnibox] Updated comment

It appears that the arguments to a function have changed, without the
comment being updated. This CL tries to update it.

Change-Id: I42e9cb9306d4e844d9d13901a549c75617e002bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838432Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Kevin Bailey <krb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702569}

components/omnibox/browser/autocomplete_controller.h

@@ -59,8 +59,10 @@ class AutocompleteController : public AutocompleteProviderListener,
 
   // |provider_types| is a bitmap containing AutocompleteProvider::Type values
   // that will (potentially, depending on platform, flags, etc.) be
-  // instantiated. |template_url_service| is used to create URLs from the
-  // autocomplete results.
+  // instantiated. |provider_client| is passed to all those providers, and
+  // is used to get access to the template URL service. |delegate| is a
+  // proxy for UI elements which need to be notified when the results get
+  // updated.
   AutocompleteController(
       std::unique_ptr<AutocompleteProviderClient> provider_client,
       AutocompleteControllerDelegate* delegate,