Do not trim input[type=password] values
BREAKING CHANGE:
Previously, input[type=password] would trim values by default, and would require an explicit ng-trim="false"
to disable the trimming behaviour. After this CL, ng-trim no longer effects input[type=password], and will
never trim the password value.
Closes#8250Closes#8230
Conflicts:
src/ng/directive/input.js