Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/de26f227f9e2
Author: Mike Habicher <mikeh@mozilla.com>
Desc: Merge pull request #23487 from wilsonpage/1060385

Bug 1060385 - [shared/pages/import] Implement gaia-header

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https://hg.mozilla.org/integration/gaia-central/rev/d918a103cb05
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1060385 - [shared/pages/import] Implement gaia-header

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https://hg.mozilla.org/integration/gaia-central/rev/4fe2dc899996
Author: Mike Habicher <mikeh@mozilla.com>
Desc: Merge pull request #23483 from wilsonpage/1060294

Bug 1060294 - [bluetooth] Update new settings.html with gaia-header

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https://hg.mozilla.org/integration/gaia-central/rev/2611fdf01fe4
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1060294 - [bluetooth] Update new settings.html with gaia-header
Bumping manifests a=b2g-bump