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: de016e52bd170d2d4f2344f9bf92d50478b649e0@76907 0039d316-1c4b-4281-b951-d872f2087c98

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