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

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https://hg.mozilla.org/integration/gaia-central/rev/72d170d61e82
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #32054 from rexboy7/1208392-align-presentation-api-for-system-app

Bug 1208392 - [Stingray][system] Receive app-open request for present… r=ehung

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https://hg.mozilla.org/integration/gaia-central/rev/767ef6bf09c4
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 1208392 - [Stingray][system] Receive app-open request for presentation API

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https://hg.mozilla.org/integration/gaia-central/rev/6da127035021
Author: Luke Chang <lchang@mozilla.com>
Desc: Merge pull request #32088 from luke-chang/1202967_camera_freeze

Bug 1202967 - Screen will be freezed if you launch camera by pressing HW camera key in Recent View, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/d3159b634230
Author: Luke Chang <lchang@mozilla.com>
Desc: Bug 1202967 - Screen will be freezed if you launch camera by pressing HW camera key in Recent View

- fixed by forcing HierarchyManager to update top most window after TaskManager is closed

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "fc198ed60573dba66a7576ee9f99a52fed7778c2", 
+        "git_revision": "14a64f1ebd353bccc3f1c0399e1a01a03327749e", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "0578f971ee9baff37107f88c998b6df3268dc417", 
+    "revision": "72d170d61e82726b0fd2a398d21796b11ab2ad66", 
     "repo_path": "integration/gaia-central"
 }