arc: Notify ARC instance failures via callbacks.

components/arc/test/fake_arc_bridge_instance.h

 // Copyright 2015 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_BRIDGE_INSTANCE_H_
 #define COMPONENTS_ARC_TEST_FAKE_ARC_BRIDGE_INSTANCE_H_
 
 #include "base/macros.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/common/arc_bridge.mojom.h"
@@ skipping 23 matching lines @@
 
   // ArcBridgeInstance:
   void Init(mojom::ArcBridgeHostPtr host) override;
 
   // Ensures the call to Init() has been dispatched.
   void WaitForInitCall();
 
   // The number of times Init() has been called.
   int init_calls() const { return init_calls_; }
 
-  // Simulates a crash by calling Stop() on the ArcBridgeBoostrap.
+  // Simulates a crash.
   void SimulateCrash();
 
  private:
   Delegate* delegate_ = nullptr;
 
   // Mojo endpoints.
   mojo::Binding<mojom::ArcBridgeInstance> binding_;
   mojom::ArcBridgeHostPtr host_ptr_;
   int init_calls_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(FakeArcBridgeInstance);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_TEST_FAKE_ARC_BRIDGE_INSTANCE_H_