Changed to onchange for select elements
Mac does not handle onclick events for select elements while other OS's do. This results in that Mac users cannot select any device other than the first one in the select element.

BUG=NONE
NOTRY=TRUE
TEST=Manual on Mac, Linux and Windows

Review URL: https://codereview.chromium.org/26584005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228441 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228441