Bug 904637: Only disconnect IndexDBParents once, r=bent

IndexDBParent::Disconnect can only be called once. During
shutdown of an app, it can happen that Disconnect of an
instance has been run before. In this case, we run from
the Disconnect method immediately.
Merge m-c to fig
Merge latest green b2g-inbound changeset and mozilla-central
Merge latest green fx-team changeset and mozilla-central
Merge m-c to fig
Bug 892837 - Support permissions in desktop webrt. ContentPermission.js changes. r=myk
Backed out changeset 3bfa589adaae (bug 892837) for landing with the wrong bug #.
Bug 905397 - Support permissions in desktop webrt. ContentPermission.js changes. r=myk
DONTBUILD
Bug 795979 - RDP, new packet type: getObjectsProperties. r=past
Bug 907072 - ES6 reftests should run with "default version", not JS 1.8.5. r=jorendorff
Bug 902729 - Add a new telemetry probe for session lifetimes. r=ttaubert
Bug 890722: IonMonkey: Implement JSOP_RETRVAL, JSOP_SETRVAL, JSOP_POPV, r=jandem
Bug 905396 - IonMonkey: Bailout function of LGenericCall now takes JSObject, r=sstangl
bug 903481 - step 1 - Move WebGL buffers function into GLContextBuffers.cpp - r=jgilbert
bug 903481 - step 2 - [WebGL 2.0] transform feedback: add symbols in GLContext - r=jgilbert
bug 903481_- step 3 - [WebGL 2.0] implement TRANSFORM_FEEDBACK_BUFFER - r=jgilbert
Bug 907085 - Don't use GetIonContext->cx during GC (r=jandem)

--HG--
extra : rebase_source : 0c442c82e71435dd8712a67cc7f01f00010f1e41
Bug 893184 - Intermittent jsreftest.html?test=ecma_5/JSON/parse-array-gc.js... r=till
Bug 901776 - Adding checks to visibility code that makes elements with hidden attribute hidden; r=mdas
Bumping gaia.json for 2 gaia-central revision(s)

========

https://hg.mozilla.org/integration/gaia-central/rev/8cd98f5085bf
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #11535 from pivanov/bug-904027

Bug 904027 - [HD][Music] Video scrubber edges looks slightly fuzzy r=samjoch

========

https://hg.mozilla.org/integration/gaia-central/rev/1c94e8e8ba98
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 904027 - [HD][Music] Video scrubber edges looks slightly fuzzy