Bumping gaia.json for 5 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/1adf38244854
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #14392 from huchengtw-moz/gallery/Bug_946327_two_activity_handling

Bug 946327 - [B2G][SMS][MMS] Tapping multiple times rapidly on a sent or..., r=djf
(cherry picked from commit 38bddda919bcfa87abb1017a0c5484bdf7d0351c)

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https://hg.mozilla.org/integration/gaia-1_2/rev/00014264ed43
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #14517 from dmarcos/bug948143

Bug 948143 - [gallery] Replace giant icons with reasonably sized one
(cherry picked from commit 329d2e6d2cf73ffe20a21c365a2015de54e7b83d)

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https://hg.mozilla.org/integration/gaia-1_2/rev/3e37db2a7220
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #14391 from huchengtw-moz/gallery/Bug_945355-2

Bug 945355 - [B2G][Gallery] Viewing picture recieved in email or MMS sho..., r=djf
(cherry picked from commit 445cbc90e986d0d47194216eabd89a24f4a0f671)

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https://hg.mozilla.org/integration/gaia-1_2/rev/1a7a809a322f
Author: Reuben Morais <reuben.morais@gmail.com>
Desc: Merge pull request #13853 from bgirard/HomescreenBorder

Bug 939392 - Remove invisible border for better performance. r=crdlc
(cherry picked from commit 019275e2e193ce7e9b5ac5f362af93ac0773722a)

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https://hg.mozilla.org/integration/gaia-1_2/rev/f3bac65e2083
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #12286 from EragonJ/bug-914317

Bug 914317 - Add a check to remove title in prompts, r=@alivedise
(cherry picked from commit fb4fd23a83ca439d317238e8cba0d72d13990d44)