Add to known_crashes.txt for 83674 and 83676.
Add to known_crashes.txt for 83674 and 83676.

(WebCore::CSSStyleSelector::loadPendingImages and WebCore::RenderStyle::hasPseudoStyle)

BUG=83674,83676
TEST=reliability bots

Review URL: http://codereview.chromium.org/7064016

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@86372 0039d316-1c4b-4281-b951-d872f2087c98

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