Convert usages of mojo::ErrorHandler in //device to callbacks.

device/devices_app/devices_app.cc

Index: device/devices_app/devices_app.cc
diff --git a/device/devices_app/devices_app.cc b/device/devices_app/devices_app.cc
index 0aab6cb1d9f785f3155b2a64735e602e7544e9d0..1f49170e8991523152136a30894a930231f03574 100644
--- a/device/devices_app/devices_app.cc
+++ b/device/devices_app/devices_app.cc
@@ -17,7 +17,6 @@
 #include "device/usb/usb_service.h"
 #include "mojo/application/public/cpp/application_connection.h"
 #include "mojo/application/public/cpp/application_impl.h"
-#include "third_party/mojo/src/mojo/public/cpp/bindings/error_handler.h"
 #include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
 #include "url/gurl.h"
 
@@ -136,7 +135,8 @@ void DevicesApp::Create(mojo::ApplicationConnection* connection,
   // Owned by its message pipe.
   usb::DeviceManagerImpl* device_manager = new usb::DeviceManagerImpl(
       request.Pass(), delegate.Pass(), service_task_runner_);
-  device_manager->set_error_handler(this);
+  device_manager->set_connection_error_handler(
+      base::Bind(&DevicesApp::OnConnectionError, base::Unretained(this)));
 
   active_device_manager_count_++;
   idle_timeout_callback_.Cancel();