Bumping gaia.json for 5 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6ae96a7dcd35
Author: Trif Andrei-Alin <trifandreialin@gmail.com>
Desc: Merge pull request #14612 from viorelaioia/bug_948622

Bug 948622 - Improve activate_edit_mode()

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https://hg.mozilla.org/integration/gaia-central/rev/7197bfcb553a
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 948622 - Improve activate_edit_mode()

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https://hg.mozilla.org/integration/gaia-central/rev/fa281f37ed10
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 944242 - Properly handle do-not-track options when upgrading from 1.1 r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/b932c9edf703
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #14713 from crdlc/bug-949437

Bug 949437 - [Download Manager] The size of files bigger than 32 Megabyt...

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https://hg.mozilla.org/integration/gaia-central/rev/097bbc332452
Author: crdlc <crdlc@tid.es>
Desc: Bug 949437 - [Download Manager] The size of files bigger than 32 Megabytes is shown as gigabytes