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

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https://hg.mozilla.org/integration/gaia-central/rev/bae156eafe93
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: Merge pull request #12688 from EverythingMe/923899-clear-button

[Bug 923899] Fix clear button clickable area [r=ranbena]

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https://hg.mozilla.org/integration/gaia-central/rev/4498a6e5916e
Author: Evyatar Amitay <evyatron@gmail.com>
Desc: [Bug 923899] Fix clear button clickable area [r=ranbena]

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "9e6d89ed045567759d4b1a8f448971ecb23c27b0", 
+    "revision": "bae156eafe930ca4fefd64d64b892e2ed88535ce", 
     "repo_path": "/integration/gaia-central"
 }