Merge mozilla-beta to b2g28. a=merge
Bug 962447 - [fugu][b2g] Should call getFailCauseCode() even the connection hasn't been established. r=vicamo, a=fabrice
bug 967341 - uri management r=honzab a=sylvestre
Bug 966322 - Work around bug 916387. a=test-only
Bug 970290 - Wait "testready" instead of "load" event. r=fabrice, a=test-only
Bug 967907 - Change the SUMO URL for Metro Firefox. r=jimm, a=sledru
Bug 968921 - "audio-channel-change" event should consider the audio channels in the background even there is an one on the foreground. r=baku, a=fabrice
Bug 965346 - Part 1: Ensure that callback is called, even when reply is null. r=mrbkap, a=fabrice
Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/70d53545803b
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16367 from gitmai/bug-968276-CC-improve-startup-time-v1-3

Bug 968276 - 300ms startup time regression in v1.3 branch Usage app

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https://hg.mozilla.org/integration/gaia-1_3/rev/37d392c9190e
Author: mai <mri@tid.es>
Desc: Bug 968276 - 300ms startup time regression in v1.3 branch Usage app
Merge mozilla-beta to b2g28. a=merge
Bumping gaia.json for 1 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/7b9e185a5aff
Author: crdlc <crdlc@tid.es>
Desc: Bug 973850 - Images are not displayed anymore in link view
Merge b2g28 to v1.3t. a=merge