Revert of Deletes mojo::Callback

device/usb/mojo/device_manager_impl.h

Index: device/usb/mojo/device_manager_impl.h
diff --git a/device/usb/mojo/device_manager_impl.h b/device/usb/mojo/device_manager_impl.h
index 87b79d883a0647a10d712bc9ce4a6c1133b66e24..2bc524a3f215c23645d5e616a76fc806ea351c8f 100644
--- a/device/usb/mojo/device_manager_impl.h
+++ b/device/usb/mojo/device_manager_impl.h
@@ -9,7 +9,6 @@
 #include <queue>
 #include <set>
 
-#include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ -46,7 +45,7 @@
                     mojo::InterfaceRequest<DeviceManager> request);
   ~DeviceManagerImpl() override;
 
-  void set_connection_error_handler(const base::Closure& error_handler) {
+  void set_connection_error_handler(const mojo::Closure& error_handler) {
     connection_error_handler_ = error_handler;
   }
 
@@ -76,7 +75,7 @@
   ScopedObserver<UsbService, UsbService::Observer> observer_;
   DeviceManagerClientPtr client_;
 
-  base::Closure connection_error_handler_;
+  mojo::Closure connection_error_handler_;
 
   mojo::StrongBinding<DeviceManager> binding_;
   base::WeakPtrFactory<DeviceManagerImpl> weak_factory_;