Bumping gaia.json for 12 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/335dfc173aab
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 927391 - Bump gaiatest version to 0.18. r=dhunt

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https://hg.mozilla.org/integration/gaia-1_2/rev/ed7103f31bde
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 926403 - Bump gaiatest version to 0.17. r=dhunt

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https://hg.mozilla.org/integration/gaia-1_2/rev/c4cb7d8742b2
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 922077 - Bump gaiatest version to 0.16. r=bebe

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https://hg.mozilla.org/integration/gaia-1_2/rev/25338f5c460a
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 920473 - Bump gaiatest version to 0.15. r=bebe

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https://hg.mozilla.org/integration/gaia-1_2/rev/ca10ff59c3c9
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 916749 - Bump gaiatest version to 0.14. r=zcampbell

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https://hg.mozilla.org/integration/gaia-1_2/rev/3a1c8e0b6dbc
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #13325 from bobsilverberg/v1.2homescreen

Bug 924114 - Migrate homescreen tests to use app objects

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https://hg.mozilla.org/integration/gaia-1_2/rev/d8119a35ed01
Author: Ana Hristova <ana.nikolaeva@gmail.com>
Desc: Bug 924114 - Migrate homescreen tests to use app objects

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https://hg.mozilla.org/integration/gaia-1_2/rev/e349e0e1a0e1
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 924918 - Extend the time we are waiting for b2g to start, to address problems running tests on devices, r=zac

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https://hg.mozilla.org/integration/gaia-1_2/rev/16bd6fe85099
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 924412 - Remove audio channels from cleanup routine that are causing the phone to crash, r=bebe

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https://hg.mozilla.org/integration/gaia-1_2/rev/816d07dd1a02
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 922062 - Skip cleanUp steps that are not necessary when --restart is passed in. r=bebe r=davehunt

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https://hg.mozilla.org/integration/gaia-1_2/rev/9528dc703718
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 921827 - Follow-up fix to use properties for the media type lists. r=bebe

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https://hg.mozilla.org/integration/gaia-1_2/rev/9df7f55fa47b
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 921827 - Split media file list into types. r=zcampbell