Bug 934514 - Don't access non-existant field on Android 4.4 r=blassey a=lsblakk

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extra : rebase_source : 989a8bb0010096ba0950ccaa96d7e642dd1d2883
Bug 932880 - Fix leaks in the devtools mochitest-bc testsuite (rollup patch). a=lsblakk
Bug 897194 - Use outer window ID to match toolbox to tab rather than assuming the currently-selected tab. r=bgrins, a=lsblakk