[Passwords] Trigger bulk check from javascript

This CL adds the missing wiring call that lets the check button trigger
the native check call.
(Only bridge code, no tests possible.)

Bug: 1047726
Change-Id: Ib430e3c10730d664c5364684c2c70ccdaff22ea7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089707
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Auto-Submit: Friedrich [CET] <fhorschig@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747731}

chrome/browser/resources/settings/autofill_page/password_manager_proxy.js

@@ -322,7 +322,9 @@ class PasswordManagerImpl {
   }
 
   /** @override */
-  startBulkPasswordCheck() {}
+  startBulkPasswordCheck() {
+    chrome.passwordsPrivate.startPasswordCheck();
+  }
 
   /** @override */
   getCompromisedCredentialsInfo() {