Bug 956724 - Fix broken onload handler for DOMWindows r=rnewman

From fdb5e3aab7479a9cf0ff7b78dcd373e296707e56 Mon Sep 17 00:00:00 2001
Bug 952934 - Use onFrameTreeReset() to re-collect docShell capability data r=smacleod

From b3a6d0ab445df9e336b969f230c1394f457dd91c Mon Sep 17 00:00:00 2001
Bug 952998 - Use FrameTree to collect DOMSessionStorage data r=yoric

From 594cc2bdabe535ef356276bce49c4b36c73ab3a2 Mon Sep 17 00:00:00 2001