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

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https://hg.mozilla.org/integration/gaia-central/rev/43778f93795d
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #19654 from theres-waldo/bug998025

Bug 998025 - Put overscrolling behind a developer pref. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/8ad64ccf63ed
Author: Botond Ballo <botond@mozilla.com>
Desc: Bug 998025 - Put overscrolling behind a developer pref. r=vingtetun

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "6d9bab15ca3a77d77bcb7bf612194a9076aca643", 
+    "revision": "43778f93795df2873a38e60f9f690648cee410ba", 
     "repo_path": "/integration/gaia-central"
 }