Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/ba18bd513a3d
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #16152 from davidflanagan/bug969761

Bug 969761: use device pixels when chosing camera preview size r=justindarc

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https://hg.mozilla.org/integration/gaia-1_3/rev/adc700dd25ee
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 969761: use device pixels when chosing camera preview size