Back out 2ccb9ec11a9f:d27ecea31590 (bug 856410) for b2g mochitest-3 failures
CLOSED TREE
Back out 7e5522d403c1 and 92fc4bf7a9e9 (bug 880879) for Android test failures
CLOSED TREE
Bug 881128: Make devtools not use window.GetSVGDocument r=bz
Bug 881128 - Remove nsIDOMGetSVGDocument r=bz
Bug 881775 - Set the correct channel count in DownmixAndInterleave, and avoid unnecessary downmixing; r=roc