Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/119a250d2e06
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19912 from kamituel/Bug_1019169_byte_str_conv

Bug 1019169: Fixed UTF <-> Uint8Array conversions

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https://hg.mozilla.org/integration/gaia-central/rev/34209d6bb6cd
Author: Kamil Leszczuk <kamituel@gmail.com>
Desc: Bug 1019169: Fixed UTF <-> Uint8Array conversions

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https://hg.mozilla.org/integration/gaia-central/rev/221cff213521
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #20033 from eeejay/bug-1020605

Bug 1020605 - (gaia-grid) Append all children to shadow root by removing...r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/100086629a94
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1020605 - (gaia-grid) Append all children to shadow root by removing <content> selector tag.

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https://hg.mozilla.org/integration/gaia-central/rev/74dad5bb0b96
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19770 from tauzen/Bug1017572

Bug 1017572 - [NFC] NfcManager proper handling of NDEF messages with no records, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/d561601b718c
Author: Krzysztof Mioduszewski <kmioduszewski@gmail.com>
Desc: [NFC] NfcManager proper handling of NDEF messages with no records
Bumping manifests a=b2g-bump