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

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https://hg.mozilla.org/integration/gaia-central/rev/b2b836ff2b51
Author: Carmen Jiménez <cjc@tid.es>
Desc: Merge pull request #21824 from mcjimenez/bug1039222

Bug 1039222 - [SingleVariant] Removed maximum MMS size customization (r =jmcanterafonseca)

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https://hg.mozilla.org/integration/gaia-central/rev/617a8cea95f9
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 1039222 - [SingleVariant] Removed maximum MMS size customization

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https://hg.mozilla.org/integration/gaia-central/rev/5cb2b7f79853
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21578 from empoalp/bug_1029448

Bug 1029448 - Copy improvements when downloading DRM content

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https://hg.mozilla.org/integration/gaia-central/rev/cf49426938bc
Author: David Garcia <davidg@tid.es>
Desc: Bug 1029448 - Copy improvements when downloading DRM content

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https://hg.mozilla.org/integration/gaia-central/rev/cc27e3068e50
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #21397 from Rik/update-xulrunner-1034565

Bug 1034565 - CSSLint complains about CSS Variables r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/8e08c9004a18
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 1034565 - CSSLint complains about CSS Variables r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/4b9358f1e937
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #21839 from dmarcos/bug1024384

Bug 1024384 - [Flame] When changing default media storage from Internal ...

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https://hg.mozilla.org/integration/gaia-central/rev/d55550263c01
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1024384 - [Flame] When changing default media storage from Internal to SD Card, the change is not effective till a power off cycle
Bumping manifests a=b2g-bump