Fix race-conditioned DevTools crash when navigating to a redirecting page
Fix race-conditioned DevTools crash when navigating to a redirecting page

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/515040

git-svn-id: http://src.chromium.org/svn/trunk/src@35299 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 3dd3260231c6532fdd086889d2a9747a50f43bb3
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