Migrate ArcBridgeService::Observer and ArcSession::Observer.

components/arc/test/fake_arc_session.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_ARC_SESSION_H_
 #define COMPONENTS_ARC_TEST_FAKE_ARC_SESSION_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "components/arc/arc_session.h"
+#include "components/arc/arc_session_observer.h"
 
 namespace arc {
 
 // A fake ArcSession that creates a local connection.
 class FakeArcSession : public ArcSession {
  public:
   FakeArcSession();
   ~FakeArcSession() override;
 
   // ArcSession overrides:
   void Start() override;
   void Stop() override;
   void OnShutdown() override;
 
   // To emulate unexpected stop, such as crash.
-  void StopWithReason(ArcBridgeService::StopReason reason);
+  void StopWithReason(ArcSessionObserver::StopReason reason);
 
   // The following control Start() behavior for testing various situations.
 
   // Enables/disables boot failure emulation, in which OnStopped(reason) will
   // be called when Start() is called.
-  void EnableBootFailureEmulation(ArcBridgeService::StopReason reason);
+  void EnableBootFailureEmulation(ArcSessionObserver::StopReason reason);
 
   // Emulate Start() is suspended at some phase, before OnReady() is invoked.
   void SuspendBoot();
 
   // Returns FakeArcSession instance. This can be used for a factory
   // in ArcBridgeServiceImpl.
   static std::unique_ptr<ArcSession> Create();
 
  private:
   bool boot_failure_emulation_enabled_ = false;
-  ArcBridgeService::StopReason boot_failure_reason_;
+  ArcSessionObserver::StopReason boot_failure_reason_;
 
   bool boot_suspended_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(FakeArcSession);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_TEST_FAKE_ARC_SESSION_H_