Add chrome_frame_helper.exe to the set of key files for Chrome Frame as that could be in use while npchrome_frame.dll isn't.
Add chrome_frame_helper.exe to the set of key files for Chrome Frame as that could be in use while npchrome_frame.dll isn't.

BUG=NONE
TEST=NONE
Review URL: http://codereview.chromium.org/6677078

git-svn-id: http://src.chromium.org/svn/trunk/src@81739 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 5d646e72d01fcf244631c824897e26a3c26a87a6
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser