Add usb_service::UsbDeviceFilter class for device matching.

chromeos/dbus/permission_broker_client.h

Index: chromeos/dbus/permission_broker_client.h
diff --git a/chromeos/dbus/permission_broker_client.h b/chromeos/dbus/permission_broker_client.h
index 17e215a41ac8b7b5c9aa9574faa4a471fbe181d4..9ee953a4cea35723b28678cc47d84d011dd3fd65 100644
--- a/chromeos/dbus/permission_broker_client.h
+++ b/chromeos/dbus/permission_broker_client.h
@@ -24,8 +24,8 @@ namespace chromeos {
 class CHROMEOS_EXPORT PermissionBrokerClient : public DBusClient {
  public:
   // The ResultCallback is used for both the RequestPathAccess and
-  // RequestUsbAcess methods. Its boolean parameter represents the result of the
-  // operation that it was submitted alongside.
+  // RequestUsbAccess methods. Its boolean parameter represents the result of
+  // the operation that it was submitted alongside.
   typedef base::Callback<void(bool)> ResultCallback;
 
   virtual ~PermissionBrokerClient();