Make GetPolicies() return null for unmanaged users

chrome/browser/chromeos/arc/arc_policy_bridge.h

Index: chrome/browser/chromeos/arc/arc_policy_bridge.h
diff --git a/chrome/browser/chromeos/arc/arc_policy_bridge.h b/chrome/browser/chromeos/arc/arc_policy_bridge.h
index 4464bb2562f27d9c3d21be6e8062e78e7a2638de..caf04f2499121470230f2c8b531925d53e5f1ebc 100644
--- a/chrome/browser/chromeos/arc/arc_policy_bridge.h
+++ b/chrome/browser/chromeos/arc/arc_policy_bridge.h
@@ -27,6 +27,8 @@ class ArcPolicyBridge : public ArcService,
                   policy::PolicyService* policy_service);
   ~ArcPolicyBridge() override;
 
+  void OverrideIsManagedForTesting(bool is_managed);
+
   // ArcBridgeService::Observer overrides.
   void OnPolicyInstanceReady() override;
   void OnPolicyInstanceClosed() override;
@@ -44,6 +46,7 @@ class ArcPolicyBridge : public ArcService,
 
   mojo::Binding<PolicyHost> binding_;
   policy::PolicyService* policy_service_ = nullptr;
+  bool is_managed_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(ArcPolicyBridge);
 };