Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/1c6d8c5c959a
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #14131 from AndreiH/bug927870_v1.2

Bug 927870 - Neaten up UI Tests app's app object

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https://hg.mozilla.org/integration/gaia-1_2/rev/0a2254000b16
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 927870 - Neaten up UI Tests app's app object