Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/52f6cb752481
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #19235 from julienw/use-spec-for-travis

Bug 1010133 - Use the "Spec" reporter on Travis r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/6fee4d51473a
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1010133 - Use the "Spec" reporter on Travis r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/230c223c687a
Author: lissyx <lissyx+github@lissyx.dyndns.org>
Desc: Merge pull request #19315 from lissyx/bug1011410

Bug 1011410 - Expose geolocation debug setting r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/a8e7dcf5f0ba
Author: Alexandre Lissy <lissyx+github@lissyx.dyndns.org>
Desc: Bug 1011410 - Expose geolocation debug setting r=arthurcc
Bumping manifests a=b2g-bump