Bug 899696 - Fix unsafe reference hazard in SendToGenerator; r=sfink

--HG--
extra : rebase_source : 302da62f20ff1ddb14f35ddb8f3032b92961f6e0
Bug 899693 - Fix unsafe reference hazards around HashableValue::setValue; r=sfink

--HG--
extra : rebase_source : f296325db530ec1f94708a657cdc7ad885a85368
Backout rev 9497429e8463 (bug 881018) to land real fix
Bug 881018 - Never inline TiledLayerBuffer::GetScaledTileLength to avoid crash; r=Cwiiis
Bug 890963 - Update site identity message for pages where Mixed Active Content has loaded. r=dolske?
Bug 899990 - Null check xhr.response to avoid spammy JS exceptions; r=jdm

--HG--
extra : rebase_source : d1b78bc695896565c8ac7d327da62f324a44bb51
Bug 900080 - Use e.message instead of e in onPacket errors, r=wlach