Remove codecForTr().

Remove codecForTr().

Similarly to change id I2f429fa7ef93bd75bb93a7f64c56db15b7283388, the capability
to arbitrarily alter the encoding of literals is very destructive, especially in
a world with libraries and plugins.

Change-Id: If0d4cd8dcf89792e39c1984cbde6b036cebfc02f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>