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

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https://hg.mozilla.org/integration/gaia-central/rev/7517cf7a456b
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #27744 from rexboy7/tv_system_presentation_api

Bug 1126666 - [System] Support remote opening app/webpage for presentati.... r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/d4f98843d128
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 1126666 - [System] Support remote opening app/webpage for presentation API

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https://hg.mozilla.org/integration/gaia-central/rev/1ea70492104e
Author: EragonJ (E.J.) <eragonj@eragonj.me>
Desc: Merge pull request #27801 from EragonJ/bug-1127257

Bug 1127257 - fix subpanels transition direction for RTL

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https://hg.mozilla.org/integration/gaia-central/rev/e3dd9aac6b6d
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 1127257 - fix subpanels transition direction for RTL

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "0051a026976a68e0ce1b9eb465c1af49eb697de3", 
+        "git_revision": "e8f1a2a5522e1449755d2affaaa3b191b17991a1", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "9d884a01232dbb739dc05790f2d4089c049d854b", 
+    "revision": "7517cf7a456b2a5486b951c2e0e13f9dc6ac3e4f", 
     "repo_path": "integration/gaia-central"
 }