Switch from Delegate to Observer.

components/arc/test/fake_policy_instance.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_ARC_TEST_FAKE_POLICY_INSTANCE_H_
 #define COMPONENTS_ARC_TEST_FAKE_POLICY_INSTANCE_H_
 
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/common/policy.mojom.h"
 #include "components/arc/instance_holder.h"
-#include "components/arc/test/fake_arc_bridge_instance.h"
 
 namespace arc {
 
 class FakePolicyInstance : public mojom::PolicyInstance {
  public:
   FakePolicyInstance();
   ~FakePolicyInstance() override;
 
   // mojom::PolicyInstance
   void Init(mojom::PolicyHostPtr host_ptr) override;
   void OnPolicyUpdated() override;
 
   void CallGetPolicies(const mojom::PolicyHost::GetPoliciesCallback& callback);
 
  private:
   mojom::PolicyHostPtr host_ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(FakePolicyInstance);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_TEST_FAKE_POLICY_INSTANCE_H_