Back out 823ab8a1c9c0:bc71821fcb9f (bug 831354) for b2g reftest failures
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Back out fdeb0c833138 (bug 814226) for Linux bc failures in browser_webapps_permissions.js
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Back out 8447875c6479 (bug 823010) for marionette failures in test_incoming.js
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Bug 832042 - Reduce cost of exact stack rooting during addition operations, r=terrence.