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

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https://hg.mozilla.org/integration/gaia-1_4/rev/1167fd794bd9
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21633 from schien/bug984274-v1.4

Bug 984274 - add required permission for mochitest. r=fabrice

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https://hg.mozilla.org/integration/gaia-1_4/rev/a3fdb5b5698b
Author: Shih-Chiang Chien <schien@mozilla.com>
Desc: Bug 984274 - add required permission for mochitest. r=fabrice
Bumping manifests a=b2g-bump
Bug 877661 - Mark mask-html-01-extref-02.xhtml as random on all platforms. a=test-only