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

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https://hg.mozilla.org/integration/gaia-central/rev/871061172463
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #17264 from evanxd/bug-981460

Bug 981460 - [gaia-marionette] Should clean the profile before we do make test-integration.

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https://hg.mozilla.org/integration/gaia-central/rev/9090a5f626f5
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 981460 - Should clean profile before do test-integration.
Bumping manifests a=b2g-bump