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

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https://hg.mozilla.org/integration/gaia-central/rev/19b56045b7c2
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1138956 - merge pull request #29522 from etiennesegonzac:bug-1138956 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/457e443b54bb
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1138956 - Prevent edge gestures from moving windows while the rocketbar is activating r=albertopq

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "3cd0a9facce26c2acc7be3755a17131a6358e33f", 
+        "git_revision": "d7a4735522fc80b6ea1496c0979c59318e29462a", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "c5c31cccfb22048626664d063643ae1fb1e2facc", 
+    "revision": "19b56045b7c20d0da9c1d2cd52f4532e025f7f38", 
     "repo_path": "integration/gaia-central"
 }