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

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https://hg.mozilla.org/integration/gaia-central/rev/77712e7cade0
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15224 from KevinGrandon/revert_15223

Bug 952629 - Revert unintentional merge.

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https://hg.mozilla.org/integration/gaia-central/rev/4a3cf47879c7
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert unintentional merge.
This reverts commit ce4151d0130481df6364ad5a540a6afeaef00e0b.
This reverts commit dfa9fa8c1802b4cc6835d8af8a745477534c2936.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "f5ec8e3ab7d295cb38ec76bfb3067ff202926c06", 
+    "revision": "77712e7cade0445c2667c500f6b6d372a5aed204", 
     "repo_path": "/integration/gaia-central"
 }