Bug 958809 - Don't put broadcasted data into the regular TabStateCache r=yoric a=lsblakk

From 082ebc3f0985d327c59158d38651d2a2a6a8ab24 Mon Sep 17 00:00:00 2001
Bug 951675 - Make sure to always copy data from the persistent cache r=yoric a=lsblakk

From 6346d40b0dd42965625545798d44f8d55890ed87 Mon Sep 17 00:00:00 2001
Bug 950132 - Ignore empty pageStyle data r=yoric a=lsblakk