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

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https://hg.mozilla.org/integration/gaia-central/rev/56551a73d660
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1161943 - merge pull request #29919 from albertopq:1161943-camera-button-activity to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/45a24b7ffae6
Author: albertopq <albert.pastor@gmail.com>
Desc: Bug 1161943 - Using topMostWindow when focusing app

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "43f1ab4d599c666c74f555e79cd4a1845598e3ec", 
+        "git_revision": "b8e9fdf58fa64ce5393a4f305b8df58d2190ac6b", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "497fd0db28c88f3347d7b87f6b78b3cf24b1669f", 
+    "revision": "56551a73d6602f426fcc1caace9786d7b910820a", 
     "repo_path": "integration/gaia-central"
 }