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

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https://hg.mozilla.org/integration/gaia-central/rev/b1e46c451397
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc: Merge pull request #13179 from mpizza/Bug_932257_keyboard_not_hidden

Bug 932257 - [keyboard] previous InputMethod will not disappear while sw...  r=rudyl.

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https://hg.mozilla.org/integration/gaia-central/rev/1d12f3c48848
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 932257 - [keyboard] previous InputMethod will not disappear while switching different keyboard app and input type
 --- while switching different inputType call resetShowingKeyboard first
 --- add unit test for switching different inputType