Bumping gaia.json for 1 gaia-1_2 revision(s) a=NPOTB

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https://hg.mozilla.org/integration/gaia-1_2/rev/5575f20d37d4
Author: gasolin <gasolin@gmail.com>
Desc: Bug 911696 - [Dialer] [Flatfish] hide dialer app in homescreen if no telephony support
Bumping gaia.json for 2 gaia-1_2 revision(s) a=NPOTB

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https://hg.mozilla.org/integration/gaia-1_2/rev/fbb2fb432a74
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #12294 from Pike/bug-917692-update-languages_all-to_dev

Bug 917692 update languages all to dev, r=kaze

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https://hg.mozilla.org/integration/gaia-1_2/rev/e6ca069f8b46
Author: Axel Hecht <axel@pike.org>
Desc: bug 917692, align languages_all and languages_dev for 1.2, r=kaze
Bug 913110 - Add a combined summary of public and private downloads. r=enn a=gavin
Bug 916430 - General Downloads API review. r=enn a=gavin
Bug 916433 - The task in the "tail.js" file of the Downloads API tests is not executed. r=felipe a=gavin
Bug 899102 - nsExternalHelperAppService should notify when cancellation is complete. r=enn a=gavin
Bug 910236 - The Downloads Panel shows one extra download for the number in "+ X other downloads". r=enn a=gavin
Bug 908256 - Stop downloads when suspending or going offline. r=paolo a=gavin
Bug 904687 - Introduce Svox Pico speech synthesis service. r=smaug f=gps a=lsblakk

 - moz.build updates.
 - Use nsISupports thread-safe decleration macros.
 - Also with PicoVoice, changed to thread-safe add/remove ref macro. We are now creating them off main thread.
 - Do initialization off main thread, but go back to main thread to register the voices.