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

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https://hg.mozilla.org/integration/gaia-2_1/rev/26a25471564a
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1055805: downsample large jpeg images before previewing as wallpaper

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https://hg.mozilla.org/integration/gaia-2_1/rev/4fbb35ab907f
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1064485 - Hide results when click clear button on rocketbar

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https://hg.mozilla.org/integration/gaia-2_1/rev/caf79a5009ea
Author: crdlc <crdlc@tid.es>
Desc: Bug 1062527 - [Homescreen] Unable to launch apps after changing the date to a previous one

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https://hg.mozilla.org/integration/gaia-2_1/rev/af51c1eaac13
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 1061750 - SV Build: Generate the configuration file for bookmarks

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https://hg.mozilla.org/integration/gaia-2_1/rev/1abf0f38b19e
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1058637 - Allow small pages not to scroll in system browser. r=vingtetun

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https://hg.mozilla.org/integration/gaia-2_1/rev/f19b3d103054
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1061118 - Dismiss keyboard on attention window requestopen or recovering
Bumping manifests a=b2g-bump