Add recent crash found by reliability bot to known_crashes.txt.  Bug for crash logged as 18700.
Add recent crash found by reliability bot to known_crashes.txt.  Bug for crash logged as 18700.

BUG=http://crbug.com/18700
TEST=less redness == more goodness

Review URL: http://codereview.chromium.org/165092

git-svn-id: http://src.chromium.org/svn/trunk/src@22678 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c94ad9518fb20fa5dc17c9ae45bb89518dea67d9
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