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

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https://hg.mozilla.org/integration/gaia-central/rev/cf55753f065b
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1161598 - merge pull request #29981 from gaye:bug-1161598-followup-followup to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/2612df274d05
Author: gaye <gaye@mozilla.com>
Desc: Bug 1161598 - Small followup cleanup on app.js

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "75ed946d415fe3ebc380ac5382b659c692780733", 
+        "git_revision": "c13ccf68fb7ca44ff91faef6774d3ae116ef3804", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "2912bd4ff68fb16a123dfd36e52655e07bc5063c", 
+    "revision": "cf55753f065be067de4a23665c92d0dca4397f27", 
     "repo_path": "integration/gaia-central"
 }