Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/9b3911bc462a
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #26629 from aosmond/bug1078435

Bug 1078435 - Add recording resolution constraint to preview size selection. r=jdarcangelo

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https://hg.mozilla.org/integration/gaia-2_1/rev/40c7529c6383
Author: Andrew Osmond <aosmond@mozilla.com>
Desc: fix comments

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https://hg.mozilla.org/integration/gaia-2_1/rev/5bbece4a9cb2
Author: Andrew Osmond <aosmond@mozilla.com>
Desc: Fix function documentation.

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https://hg.mozilla.org/integration/gaia-2_1/rev/4bf7a5e1b485
Author: Andrew Osmond <aosmond@mozilla.com>
Desc: Merge branch 'v2.1' into bug1078435

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https://hg.mozilla.org/integration/gaia-2_1/rev/82f1d2509029
Author: Andrew Osmond <aosmond@mozilla.com>
Desc: Bug 1078435 - Add recording resolution constraint to preview size selection.