Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/88ea00e50347
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #28759 from eeejay/bug-1129200

Bug 1129200 - Listen for wheel events for screen reader swipe input. r=pdahiya

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https://hg.mozilla.org/integration/gaia-central/rev/5040f1fe7e2c
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1129200 - Listen for wheel events for screen reader swipe input.

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https://hg.mozilla.org/integration/gaia-central/rev/80659e409304
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1139999 - merge pull request #28753 from mwargers:assertion2 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/a3b91246c5b3
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1139999 - Re-enable tests on linux debug b2g desktop that were disabled by bug 1103106

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "dd008a75bdcb53804b83484abe33fd7a6be96873", 
+        "git_revision": "63d6639acd771f548a2613f07f3e335921e4ac87", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "8d69e9d80928334c9516cc3197f69191fc9cd70a", 
+    "revision": "88ea00e50347a506ef1c379839d766b883bc4dae", 
     "repo_path": "integration/gaia-central"
 }