Make BrowserCloudManagementStatusProvider::IsManaged non blocking.

BrowserCloudManagementStatusProvider::IsManaged was using
policy::BrowserDMTokenStorage::RetrieveDMToken to determine if the
browser was managed, and that call was making some blocking I/O, now we
look at the existence of a MachineLevelUserCloudPolicyManager.
MachineLevelUserCloudPolicyManager will be created only if the browser
is managed by CBCM.


Bug: 1150377
Change-Id: I3ec4b165577ffac864c5f2a5045d53b21196e3a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547327
Commit-Queue: Yann Dago <ydago@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831028}

chrome/browser/enterprise/browser_management/browser_management_status_provider.cc

@@ -22,8 +22,13 @@ BrowserCloudManagementStatusProvider::~BrowserCloudManagementStatusProvider() =
     default;
 
 bool BrowserCloudManagementStatusProvider::IsManaged() {
-#if !defined(OS_ANDROID)
+#if defined(OS_CHROMEOS)
   return policy::BrowserDMTokenStorage::Get()->RetrieveDMToken().is_valid();
+#elif !defined(OS_ANDROID)
+  // A machine level user cloud policy manager is only created if the browser is
+  // managed by CBCM.
+  return g_browser_process->browser_policy_connector()
+             ->machine_level_user_cloud_policy_manager() != nullptr;
 #else
   return false;
 #endif