[REM] mail: remove duplicated method
[REM] mail: remove duplicated method

This commit remove duplicated code probably due to a forward-port of a backport
or something like that. Or maybe due to a cosmic beam.

See commits https://github.com/odoo/odoo/commit/14f80bfae66f2c81abb0b8acc0ac558c60ef1d44 and https://github.com/odoo/odoo/commit/36141931bf9a57d01747cb219fdcfdfd7978ab42.

Cheers.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo