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

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https://hg.mozilla.org/integration/gaia-central/rev/f90c9ab3d3fa
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1134436 - merge pull request #28324 from punamdahiya:Bug1134436 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/64943b8fde47
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug 1134436 - [Gallery][RTL] - Exposure slider is not mirrored r= djf

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "a290cd24d46ad8ad3febb1e33b4e4be53913dd6b", 
+        "git_revision": "dc4362a00f18d6d5786722c974b2326f493ffe32", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "d4b273de0b964c396a621b5fbd575df972b084f7", 
+    "revision": "f90c9ab3d3fa055f876e26976a6384d7b22d7797", 
     "repo_path": "integration/gaia-central"
 }