[CrOS Settings] Remove invalid DCHECK() to prevent crash.

The DCHECK() verified that we only bound the UserActionRecorder once
during the lifetime of the OsSettingsUi class. However, I had not
realized that refreshing the settings page reuses the same underlying
OsSettingsUi object, so the BindInterface() function is actually
expected to be called once per load of the page (regardless of initial
load or refresh).

Fixed: 1055001
Change-Id: I4d22ec27a5279483d795de18c4f591f83984bf2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2085532
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746507}

chrome/browser/ui/webui/settings/chromeos/os_settings_ui.cc

@@ -446,8 +446,6 @@ void OSSettingsUI::BindInterface(
 
 void OSSettingsUI::BindInterface(
     mojo::PendingReceiver<mojom::UserActionRecorder> receiver) {
-  DCHECK(!user_action_recorder_)
-      << "Should only be bound once per settings session.";
   user_action_recorder_ =
       std::make_unique<SettingsUserActionTracker>(std::move(receiver));
 }