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

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https://hg.mozilla.org/integration/gaia-central/rev/9768868c8809
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1100945 - merge pull request #26301 from mozfreddyb:origin-mozfreddyb/bug-1100945-passcodehelper to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/edac1226a541
Author: Frederik B <fbraun+gh@mozilla.com>
Desc: Bug 1100945 - adding a PasscodeHelper, r=snowmantw

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "5b672c15527409b7bf7f18db4291d25608f21150", 
+        "git_revision": "4be474007ef5b3f2ed530286559d6245d3a66e89", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "aa956413b2ada59daeb853822e14eabb8e2bf991", 
+    "revision": "9768868c8809797c941c6cf2c63bd4707829a4ae", 
     "repo_path": "integration/gaia-central"
 }