Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/3d9a98142025
Author: cctuan <georgeiscoming@gmail.com>
Desc: Revert "Bug 922462 - Define various size of icons in manifest instead of use buildscript"

This reverts commit 32153515a3eedad26aec89322e02934a0dc06a0f.

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https://hg.mozilla.org/integration/gaia-1_2/rev/5a9252147e52
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #12569 from cctuan/922462

Bug 922462 - [Flatfish] use 1.5x icon from manifest for tablet(cherry picked from commit 3c3eda6d93d7329f437b71d03c3d28353f1f3d4c)
Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/d311fcbaf3f0
Author: Albert <acperez@tid.es>
Desc: Bug 917740 - Update file format of customization files based on MCC/MNC r=amac,salva,yurenju
Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/a31d722fd592
Author: Albert <acperez@tid.es>
Desc: Merge pull request #12571 from acperez/bug-922560

Bug 922560 - Fix typo error. r=yurenju(cherry picked from commit 67243760c86561e365bdd6def519105366e24be3)