Revert "Bug 828237 - [Keyboard] Switch to new keyboard layout if language is changed. r=djf"

This reverts commit a6752c70c6b8ad63f76712d17c7c40bb758e3bed.
Merge pull request #9666 from davidflanagan/backout-keyboard-patch

Revert "Bug 828237 - [Keyboard] Switch to new keyboard layout if languag...