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

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https://hg.mozilla.org/integration/gaia-central/rev/e355317309b0
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12438 from bebef1987/bug-920449

Bug 920449 - Refactor test_cards_view_with_one_app.py

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https://hg.mozilla.org/integration/gaia-central/rev/448bb2e702e7
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 920449 - Refactor test_cards_view_with_one_app.py

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "e3ae2f87c07957c8e84e4c985587262b066d0e7f", 
+    "revision": "e355317309b03c3a46e84aaf293054602fe1ec7a", 
     "repo_path": "/integration/gaia-central"
 }