Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a4ef800576e5
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #14704 from KevinGrandon/bug_826274_annoying_sound

Bug 826274 - Disabled lock screen sound still plays r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/221a6c457f11
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 826274 - Disabled lock screen sound still plays
Merge mozilla-central to b2g-inbound
Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/2cadc5d69c72
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Merge pull request #14752 from gregorwagner/back

Travis bustage fix.

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https://hg.mozilla.org/integration/gaia-central/rev/9005e1961498
Author: Gregor Wagner <anygregor@gmail.com>
Desc: Travis bustage fix
Bug 901457 - [sms][mms] We need a property for the "sent" timestamp (part 1, IDL changes). sr=sicking f=vicamo
Bug 901457 - [sms][mms] We need a property for the "sent" timestamp (part 2, implementation). r=vicamo
Bug 948128. Add StackArray helper. r=Bas

This is helpful for when we want to convert between
different types and we need a short lived piece of memory.

--HG--
extra : rebase_source : b841a535cb1ddd837df4b34949bd34054c438c67
Bug 785905 - Build Ion MIR graph off thread, r=jandem.
Bug 950716 - SpiderMonkey: A minor BitSet::Iterator refactoring. r=nbp
Bug 950716 - IonMonkey: Optimize BitSet a little r=nbp
Bug 950716 - IonMonkey: Reorder struct fields for micro-efficiency. r=nbp
Bug 949108 - Fix an exact rooting false positive across the activity callback; r=bholley

--HG--
extra : rebase_source : 9c4f0b94b376f9a2d11c5f031b8a8ef27aa2e4fb
Merge m-c to inbound.
Bug 950456 - Fix tracing for baseline type monitor and update stubs, r=jandem.
Bug 950503 - Build accessible/src/windows in unified mode; r=tbsaunde
Bug 950293 (Part 1) - Fix handling of little-endian EXIF data. r=tn
Bug 877115 - [Moz2Dify] Part 1. Remove ImageFormat typedef from GLContext. (r=nical)
Bug 877115 - [Moz2Dify] Part 2. Moz2Dify GLContext::ResizeOffscreen signature. (carries r=nical)
Bug 877115 - [Moz2Dify] Part 3. Change gfxIntSize to gfx::IntSize in GLContext::OffscreenSize and dependendent classes. r=nical
Bug 877115 - [Moz2Dify] Part 4. Change gfxIntSize to gfx::IntSize in GLScreenBuffer and friends. (carries r=nical)
Bug 877115 - [Moz2Dify] Part 5. Minimize gfxIntSize usage in GLContext. r=nical