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

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https://hg.mozilla.org/integration/gaia-central/rev/5202f9aaf844
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #25824 from weideng/bug1020847

Bug 1020847 - [Keyboard][Handwriting] Support handwriting for Simplified...
r=timdream.

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https://hg.mozilla.org/integration/gaia-central/rev/73bd9fda5c62
Author: wdeng <wdeng@mozilla.com>
Desc: Bug 1020847 - [Keyboard][Handwriting] Support handwriting for Simplified Chinese
Bumping manifests a=b2g-bump