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

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https://hg.mozilla.org/integration/gaia-central/rev/609201aba1a4
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12379 from lightsofapollo/backout-incremental-commits

Revert "Merge pull request #10981 from ganesh7/bug_819628"

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https://hg.mozilla.org/integration/gaia-central/rev/c5123c3ba5cd
Author: James Lal <james@lightsofapollo.com>
Desc: Revert "Merge pull request #10981 from ganesh7/bug_819628"

This reverts commit 8a91b987b57e01d03eded32c33a68595bd0949cb, reversing
changes made to dfff18a59944e64f527030ff71223f30d8f45840.
Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/9d76b9a19325
Author: Fabrice Desré <fabrice@desre.org>
Desc: Bug 919579 - Silent the SINGLE_VARIANT_CONF_FILE loading error r=vingtetun
Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/df1654f408ae
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 918576 - [B2G][SMS] The text MMS does not appear above the send button when attaching the first attachment r=gnarf

* compose.js: trigger the input event after changing the type
* thread_ui.js: don't do anything in the asynchronous getSegmentInfoForText
  callback if the type is not SMS at this point

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https://hg.mozilla.org/integration/gaia-central/rev/68e5065474a4
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Revert "Merge pull request #12435 from zacc/bug917523"

This reverts commit 3ca1ab7595d79f5a3b8351ed1c2a4fdaa664404b, reversing
changes made to bdb0cbb93224aa1f09afeb9c7a7fc3a66c61d28d.