Re-enabled UserCloudPolicyManagerChromeOS unit tests

chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h

Index: chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h
diff --git a/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h b/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h
index e61db3d4dc1f3433cfadccf2eb3a0c4271fe1fc5..e3ef6166e19546c72b5f430889a033dbee8814ed 100644
--- a/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h
+++ b/chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h
@@ -105,6 +105,9 @@ class UserCloudPolicyManagerChromeOS : public CloudPolicyManager,
   // CloudPolicyManager:
   void OnStoreLoaded(CloudPolicyStore* cloud_policy_store) override;
 
+  // Helper function to force a policy fetch timeout.
+  void ForceTimeoutForTest();
+
  protected:
   // CloudPolicyManager:
   void GetChromePolicy(PolicyMap* policy_map) override;