Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3effd540b0b3
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #13507 from MBRSL/bug-935835-tab

Bug - 935835 [HW test] [polish] highlight the selected tab, r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/4455bcb04f41
Author: Tom Jao <tjao@mozilla.com>
Desc: BUG - 935835 [HW test] [polish] highlight the selected tab

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https://hg.mozilla.org/integration/gaia-central/rev/b4922a86370a
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #13560 from luke-chang/936986_pinyin_unit_test_failure

Bug 936986 - [Test][keyboard] Travis unit test failure on "jspinyin deactivate", r=rudylu

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https://hg.mozilla.org/integration/gaia-central/rev/82d46b3b726f
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 936986 - [Test][keyboard] Travis unit test failure on "jspinyin deactivate"