Adding stack trace to known crashes list.
Adding stack trace to known crashes list.

Also updating another trace sig to SUBSTRING so that it matches a second relevant trace.

BUG=47439

Review URL: http://codereview.chromium.org/2870024

git-svn-id: http://src.chromium.org/svn/trunk/src@50785 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: b4dbdfe9ed1afda7ecf825cd8807bb30f3a7f63e
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