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

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https://hg.mozilla.org/integration/gaia-central/rev/3c46da026d6b
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #20750 from RudyLu/keyboard/Bug1015541

Bug 1015541 - choosing a word suggestion after moving the caret changes the wrong text
r=janjongboom

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https://hg.mozilla.org/integration/gaia-central/rev/ab042ac92fbb
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 1015541 - choosing a word suggestion after moving the caret changes
the wrong text.
 - Ignore selectionchange when there is pending key action.
Bumping manifests a=b2g-bump