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

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https://hg.mozilla.org/integration/gaia-central/rev/413c73e231fd
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #29417 from huchengtw-moz/bug-1152666-jshint-telephony

Bug 1152666 - [System] fix jshint errors/warnings for telephony related ..., r=gduan

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https://hg.mozilla.org/integration/gaia-central/rev/fa472d018441
Author: John Hu <johu@mozilla.com>
Desc: Bug 1152666 - [System] fix jshint errors/warnings for telephony related files

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "8b899668a5ef6effcd8b2bd84eea5c1450a3f207", 
+        "git_revision": "68bc942912c5da7974c8220e8824355db3848d9c", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "66185fa4a6325e89a1cd926116ec819b1803640b", 
+    "revision": "413c73e231fdf1a5c56ef0bad2548426c12690f2", 
     "repo_path": "integration/gaia-central"
 }