Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b7b700d73898
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #13693 from RudyLu/keyboard/Bug936723-filter_unprivileged_keyboard_apps

Bug 936723 - [keyboard] don't allow user to enable keyboard apps that
r=gnarf, gary

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https://hg.mozilla.org/integration/gaia-central/rev/c586737ba427
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 936723 - [keyboard] don't allow user to enable keyboard apps that
don't have required trust level.
 - Filter out keyboard apps that do not have input permission and
   correct privilege level.

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https://hg.mozilla.org/integration/gaia-central/rev/283cb86b140c
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #13653 from huchengtw-moz/gallery/Bug_935072_crop_handle_hard_to_grab

Bug 935072 - [B2G][Gallery] Crop handles are difficult to grab and move, r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/085fa3ee852d
Author: John Hu <johu@mozilla.com>
Desc: Bug 935072 - [B2G][Gallery] Crop handles are difficult to grab and move

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "3760ab2fb5d252a6a677224f1d8b3ab66677212d", 
+    "revision": "b7b700d7389880370c8aa2dc77973ad8c1bd7ca8", 
     "repo_path": "/integration/gaia-central"
 }