Update known crash.
Update known crash.

Add new crash signature: Crash in WebCore::HTMLTreeBuilder::constructTreeFromAtomicToken (74926)

Found http://build.chromium.org/p/chromium/builders/Win%20Reliability/builds/2443/steps/reliability%3A%20partial%20result%20of%20current%20build/logs/stdio

BUG=none
TEST=none
TBR=huanr

Review URL: http://codereview.chromium.org/6623012

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@76907 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser