Make a DCHECK in Browser::ExecuteCommandWithDisposition more informative.
Make a DCHECK in Browser::ExecuteCommandWithDisposition more informative.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/5099001

git-svn-id: http://src.chromium.org/svn/trunk/src@66711 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: b2e1b4444553e7b3a7351a1447159e568ffb1b41
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