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

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https://hg.mozilla.org/integration/gaia-central/rev/0818ccb401e7
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #16353 from snowmantw/issue973501

Bug 973501 - [LockScreen] Fix undefined "lockScreen" and "LockScreen"

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https://hg.mozilla.org/integration/gaia-central/rev/2754ec8d427a
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 973501 - [LockScreen] Fix undefined "lockScreen" and "LockScreen"
Bumping manifests a=b2g-bump