Screen Magnifier: Change keyboard shortcut from [ALT + Scroll] to [CTRL + ALT + Scroll]

BUG=153961
TEST=manual
TBR=sky@chromium.org
# TRBing for a simple change.

Review URL: https://chromiumcodereview.appspot.com/11026062

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@160353 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed