Bumping gaia.json for 3 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/7c39fbc4280d
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #15238 from timdream/keyboard-remove-ime-v1.3

Bug 956659

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https://hg.mozilla.org/integration/gaia-1_3/rev/a00191b6dd5a
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 956659 - Part II (v1.3 only) skip JSPinyin tests for now

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https://hg.mozilla.org/integration/gaia-1_3/rev/bdda22ad1465
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Revert "Revert "Merge pull request #15035 from timdream/keyboard-remove-ime""

This reverts commit 67b35df4ab2ee428b32ca041fb95a9383642a253.