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

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https://hg.mozilla.org/integration/gaia-central/rev/7117a0a4a2a2
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #21957 from khuey/willReadFrequently

Bug 1041112: Add willReadFrequently to grid_icon_renderer to avoid hitti.... r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/a86b261cff81
Author: Kyle Huey <khuey@kylehuey.com>
Desc: Bug 1041112: Add willReadFrequently to grid_icon_renderer to avoid hitting the memory-hungry HW accelerated canvas code. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/9df7cca4957f
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #21569 from weideng/keyboard

Bug 1021505 - Modify Pinyin keyboard to new UX. r=rlu

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https://hg.mozilla.org/integration/gaia-central/rev/e0c64fca49b6
Author: wdeng <wdeng@mozilla.com>
Desc: Bug 1021505 - Modify Pinyin keyboard to new UX
Bumping manifests a=b2g-bump