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

========

https://hg.mozilla.org/integration/gaia-central/rev/31b41a3f708e
Author: No-Jun Park <npark@mozilla.com>
Desc: Merge pull request #29551 from npark-mozilla/1155299

Bug 1155299 - Update manifest file for imagecompare (i.e. define additional smoke tests)

========

https://hg.mozilla.org/integration/gaia-central/rev/9c3b4d0cd47b
Author: No-Jun Park <npark@mozilla.com>
Desc: Additional tests are marked as smoketests

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "bef174b279f8eff82b7a2d06414b0ccdd83dd06c", 
+        "git_revision": "c6b04efa0f31a584e6ee0a46dd2b64c1e3c29adc", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "64d5a983ba85c1fee6ffc533abdd696b36ca1405", 
+    "revision": "31b41a3f708e732cbcf8fab8a51d1620ae1ebe82", 
     "repo_path": "integration/gaia-central"
 }