Remove ArcSessionManager::Observer::OnArcBridgeShutdown.

chrome/browser/chromeos/arc/arc_session_manager.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 CHROME_BROWSER_CHROMEOS_ARC_ARC_SESSION_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_SESSION_MANAGER_H_
 
 #include <memory>
 #include <ostream>
 #include <string>
@@ skipping 72 matching lines @@
     SHOWING_TERMS_OF_SERVICE,
     CHECKING_ANDROID_MANAGEMENT,
     REMOVING_DATA_DIR,
     ACTIVE,
   };
 
   class Observer {
    public:
     virtual ~Observer() = default;
 
-    // Called to notify that ARC session is shut down.
-    // TODO(hidehiko): Rename the observer callback to OnArcSessionShutdown().
-    virtual void OnArcBridgeShutdown() {}
-
     // Called to notify that whether Google Play Store is enabled or not, which
     // is represented by "arc.enabled" preference, is updated.
     virtual void OnArcPlayStoreEnabledChanged(bool enabled) {}
 
     // Called to notify that ARC has been initialized successfully.
     virtual void OnArcInitialStart() {}
 
     // Called to notify that Android data has been removed. Used in
     // browser_tests
     virtual void OnArcDataRemoved() {}
@@ skipping 180 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ArcSessionManager);
 };
 
 // Outputs the stringified |state| to |os|. This is only for logging purposes.
 std::ostream& operator<<(std::ostream& os,
                          const ArcSessionManager::State& state);
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_SESSION_MANAGER_H_