Bug 942229 - Intermittent browser_cmd_screenshot.js, r=jwalker

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extra : rebase_source : f44fec6e46526a1381ac956bc362f82e11c1123c
Bug 899910 - Intermittent TEST-UNEXPECTED-FAIL | layout/base/tests/chrome/test_leaf_layers_partition_browser_window.xul, r=tn

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extra : rebase_source : 58d21857e892a875acbea32d653f243ba9c75ad6