arc_bridge: Add more logging, plus cleanup

components/arc/arc_bridge_bootstrap.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_ARC_BRIDGE_BOOTSTRAP_H_
 #define COMPONENTS_ARC_ARC_BRIDGE_BOOTSTRAP_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 10 matching lines @@
  public:
   class Delegate {
    public:
     virtual void OnConnectionEstablished(
         mojom::ArcBridgeInstancePtr instance_ptr) = 0;
     virtual void OnStopped() = 0;
   };
 
   // Creates a default instance of ArcBridgeBootstrap.
   static std::unique_ptr<ArcBridgeBootstrap> Create();
-  virtual ~ArcBridgeBootstrap();
+  virtual ~ArcBridgeBootstrap() = default;
 
   // This must be called before calling Start() or Stop(). |delegate| is owned
   // by the caller and must outlive this instance.
   void set_delegate(Delegate* delegate) { delegate_ = delegate; }
 
   // Starts and bootstraps a connection with the instance. The Delegate's
   // OnConnectionEstablished() will be called if the bootstrapping is
   // successful, or OnStopped() if it is not.
   virtual void Start() = 0;
 
   // Stops the currently-running instance.
   virtual void Stop() = 0;
 
  protected:
-  ArcBridgeBootstrap();
+  ArcBridgeBootstrap() = default;
 
   // Owned by the caller.
   Delegate* delegate_ = nullptr;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ArcBridgeBootstrap);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_ARC_BRIDGE_BOOTSTRAP_H_