Removes the layout-switching to dvorak, qwerty or system qwerty.

BUG=339204

Review URL: https://codereview.chromium.org/141713004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247848 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247848