[rAC,OSX] Allow copy/paste in rAC sign-in dialog.

Allows application-wide accelerators in the sign-in dialog by
redispatching unhandled keys to the current event processing window.

This will properly route them to OSX's application menu handler.

BUG=324198
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/125373002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243263 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243263
app_list_view: Correct spelling and formatting mistake.

Review URL: https://codereview.chromium.org/114623005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243264 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243264