Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a4b4874d8409
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19451 from KevinGrandon/bug_1010998_gaia_confirm_component

Bug 1010998 - Create gaia-confirm web component

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https://hg.mozilla.org/integration/gaia-central/rev/02e64bfb2c3f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1010998 - Create gaia-confirm web component r=amirn

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https://hg.mozilla.org/integration/gaia-central/rev/a957457aefd6
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #19292 from wilsonpage/1008039

Bug 1008039 - [Flame][Camera][1.4][2.0] Tapping the 'switch camera' button 4

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https://hg.mozilla.org/integration/gaia-central/rev/2e4950bbee53
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1008039 - [Flame][Camera][1.4][2.0] Tapping the 'switch camera' button 4 times rapidly results in black viewfinder

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https://hg.mozilla.org/integration/gaia-central/rev/b030a0374a0a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19479 from EverythingMe/gaia-menu-component

Bug 1013842 - Create gaia-menu Web Component [r=kgrandon]

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https://hg.mozilla.org/integration/gaia-central/rev/cedfaf1de47c
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 1013842 - Create gaia-menu Web Component [r=kgrandon]
Bumping manifests a=b2g-bump