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: de016e52bd170d2d4f2344f9bf92d50478b649e0@22678 0039d316-1c4b-4281-b951-d872f2087c98

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