When applying a full update on a 32-bit-only system, check the bitness of the Chrome that's about to be installed, not the Chrome that's already installed.

BUG=303280
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/133083003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246689 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246689