Do not write magic string to registry for non Google Chrome builds.
Do not write magic string to registry for non Google Chrome builds.

BUG=15410

Review URL: http://codereview.chromium.org/147216

git-svn-id: http://src.chromium.org/svn/trunk/src@19436 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a2d8e5ace37c63820116ab06ac9bfc3fb03e1b67
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