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

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https://hg.mozilla.org/integration/gaia-central/rev/c0851973e42d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #29037 from KevinGrandon/bug_1146078_debug_failing_tc_contact_test

Bug 1146078 - Include fb_resolver.js to avoid races with imgLoader being undefined

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https://hg.mozilla.org/integration/gaia-central/rev/2df9fcb1b1b7
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1146078 - Include fb_resolver.js to avoid races with imgLoader being undefined

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "36e8153edd11dfbd36df26eeac9dc19216137d62", 
+        "git_revision": "84e6931b468f58e8df6436a18f409d082a7f58c4", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "f0a4673c12a15a394d2f2e2dbae8e70076477c7a", 
+    "revision": "c0851973e42d23cb8e29743ffa1d3311be5d5ba7", 
     "repo_path": "integration/gaia-central"
 }