Set the modifier key mapping before preload engines.

As described in the comment, we should set the modifier key mapping
before we change the current keyboard layout.

BUG=chromium-os:11697
TEST=confirm the errors don't appear in ui.LATEST

Review URL: http://codereview.chromium.org/6453002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@74252 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed