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

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https://hg.mozilla.org/integration/gaia-central/rev/43baac842b30
Author: Andrew Halberstadt <halbersa@gmail.com>
Desc: Merge pull request #25669 from ahal/fix_search_timeout

Bug 1091783 - Fix places in gaia integration tests that depended on mari...

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https://hg.mozilla.org/integration/gaia-central/rev/4c179fee25a5
Author: Andrew Halberstadt <halbersa@gmail.com>
Desc: Bug 1091783 - Fix Gij tests which depend on broken marionette.findElements() functionality, r=kgrandon,mcav
Bumping manifests a=b2g-bump