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

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https://hg.mozilla.org/integration/gaia-central/rev/340ca395d9cb
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #17492 from KevinGrandon/debug_intermittent_tests_fix

Bug 986960 - Intermittent erroring test, should flick through images in fullscreen mode

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https://hg.mozilla.org/integration/gaia-central/rev/b8ec955cd564
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 986960 - Intermittent erroring test, should flick through images in fullscreen mode

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "branch": "", 
         "revision": ""
     }, 
-    "revision": "28ee3fb643b9403bf8cc141142087fe311084609", 
+    "revision": "340ca395d9cbeedd3d25abf2c12549b99dbf0a11", 
     "repo_path": "/integration/gaia-central"
 }