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

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https://hg.mozilla.org/integration/gaia-central/rev/c66794fd7c04
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1139437 - merge pull request #28870 from millermedeiros:1139437-simplify-multi-day-view to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/31aa78912297
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Bug 1139437 - [Calendar] simplify the way elements are built on week and day views

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "67d5014e2f9bd044cfbf590d258cdc27a901afa6", 
+        "git_revision": "16ca93386e21793e80e5902f5dfeb2932902370a", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "c864ff692e0c96fef64adc83e89ee65fba3a30e3", 
+    "revision": "c66794fd7c041e0df5d567ab940e9a84b9e818e7", 
     "repo_path": "integration/gaia-central"
 }