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

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https://hg.mozilla.org/integration/gaia-central/rev/12f062ba6100
Author: Zac <zcampbell@mozilla.com>
Desc: Revert "Bug 1027570 - Update testing lockscreen atom as per bug 970824."

This reverts commit ddcbf3630af82f08549e35d5d1b2fa245e9049d6.

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https://hg.mozilla.org/integration/gaia-central/rev/0286757a81e3
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #20898 from zacc/bug_1027570

Bug 1027570 - Update testing lockscreen atom as per bug 970824.

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https://hg.mozilla.org/integration/gaia-central/rev/ddf1877b32fa
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1027570 - Update testing lockscreen atom as per bug 970824.

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https://hg.mozilla.org/integration/gaia-central/rev/968f8373f20c
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #20992 from justindarc/bug1014968

Bug 1014968 - [B2G][Camera][Flame] When watching a video preview in came...

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https://hg.mozilla.org/integration/gaia-central/rev/69669880bf57
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1014968 - [B2G][Camera][Flame] When watching a video preview in camera, there will be a cropping issue towards the end of the video
Bumping manifests a=b2g-bump