Don't spontaneously open new windows.
Don't spontaneously open new windows.

When users downgrade, they may get a chrome binary that doesn't respect --product-version; don't allow chrome binaries launched with this flag to open new windows in existing chrome processes.

BUG=46547
TEST=manual

Review URL: http://codereview.chromium.org/2814007

git-svn-id: http://src.chromium.org/svn/trunk/src@49894 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c593f3ff6d7939f9e199f345a1be371c4189369c
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