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

========

https://hg.mozilla.org/integration/gaia-central/rev/19761d0d782f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1139803 - Use visibility change counter to testify selection utility bubble's hide/show function when scroll start/end."

This reverts commit 819305fe40af18ca6dcaf915dc23786937a6c11a.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "fdc700c05183edd93173a9cab57234b888e974c7", 
+        "git_revision": "508b8d48fb5ecf08bf0e5b4fef42bc48b770e7f2", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "f002c1b395d732c10e66cb5c447e3d03e4d863b8", 
+    "revision": "19761d0d782f0b33d2605bae9aa2e135e592d622", 
     "repo_path": "integration/gaia-central"
 }