arc_bridge: Add more logging, plus cleanup

components/arc/arc_bridge_bootstrap.h

Index: components/arc/arc_bridge_bootstrap.h
diff --git a/components/arc/arc_bridge_bootstrap.h b/components/arc/arc_bridge_bootstrap.h
index 44cfc7f0ceb5178fc02b0476511dc2848db18088..918c2c0bba838a31e4fa36bc55ae9c825c10e2c5 100644
--- a/components/arc/arc_bridge_bootstrap.h
+++ b/components/arc/arc_bridge_bootstrap.h
@@ -28,7 +28,7 @@ class ArcBridgeBootstrap {
 
   // 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.
@@ -43,7 +43,7 @@ class ArcBridgeBootstrap {
   virtual void Stop() = 0;
 
  protected:
-  ArcBridgeBootstrap();
+  ArcBridgeBootstrap() = default;
 
   // Owned by the caller.
   Delegate* delegate_ = nullptr;