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

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https://hg.mozilla.org/integration/gaia-central/rev/45fc76dab544
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #14638 from timdream/include-pinyin

Bug 949958 - Include Pinyin IME in eng build by default, r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/3a118a3c0534
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 949958 - Include Pinyin IME in eng build by default