Bumping gaia.json for 8 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/1bf875cb6ada
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1091069 - Restoring the progress bar on the browser

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https://hg.mozilla.org/integration/gaia-2_1/rev/26d005a2db2e
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1088391 - Set orientation on callscreen opening

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https://hg.mozilla.org/integration/gaia-2_1/rev/b7aceef8f346
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25607 from mancas/bug1082936_v2.1

Bug 1082936 - STK messages are seen overlapping each other. Patch v2.1

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https://hg.mozilla.org/integration/gaia-2_1/rev/3f5cc71789f3
Author: Manuel Casas <manuel.casasbarrado@telefonica.com>
Desc: Bug 1082936 - STK messages are seen overlapping each other. Patch v2.1

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https://hg.mozilla.org/integration/gaia-2_1/rev/c891ffe292ed
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25520 from luke-chang/1079129_v2.1_fullscreen_prompt_overlay_lockscreen

Bug 1079129 - [Woodduck] Lock screen is hidden by full screen prompt message

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https://hg.mozilla.org/integration/gaia-2_1/rev/3e2704f9319b
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 1079129 - [Woodduck] Lock screen is hidden by full screen prompt message

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https://hg.mozilla.org/integration/gaia-2_1/rev/cc5eec5ea14d
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25379 from daleharvey/v2.1-1072531

Bug 1076613 - Separate the homescreen related thing from appwindowmanage...

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https://hg.mozilla.org/integration/gaia-2_1/rev/a07346456473
Author: John Hu <im@john.hu>
Desc: Bug 1076613 - Separate the homescreen related thing from appwindowmanager as homescreenwindowmanager

Conflicts:
	apps/system/js/app_window_manager.js
Bumping manifests a=b2g-bump