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

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https://hg.mozilla.org/integration/gaia-central/rev/c59be1a8fe19
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #17058 from shamenchens/Bug981499-Keyboard-Highlight-master

Bug 981499 - The arrow icon of the candidate panel in Asian language input methods is rendered incorrectly

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https://hg.mozilla.org/integration/gaia-central/rev/5fd1ea0f98f1
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 981499 - The arrow icon of the candidate panel in Asian language input methods is rendered incorrectly
Bumping manifests a=b2g-bump