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

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https://hg.mozilla.org/integration/gaia-central/rev/4b0c5028af2d
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #13103 from davidflanagan/bug923544

Bug 923544: remove unneeded workaround that was causing problems r=aus

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https://hg.mozilla.org/integration/gaia-central/rev/0f1335ef559e
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 923544: remove unneeded workaround that was causing problems