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

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https://hg.mozilla.org/integration/gaia-central/rev/57c31aebba1b
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #33769 from mikehenrty/bug-1236329-no-getelementsbytagname

Bug 1236329 - Change browser_video_test.js to use querySelector inste…

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https://hg.mozilla.org/integration/gaia-central/rev/e8fff68725ae
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1236329 - Change browser_video_test.js to use querySelector instead of getElementsByTagName

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "a59c28fabdff02a576d879f332a5c169fc12e6df", 
+        "git_revision": "24e396513a6409870db425f48e4998d7160d267f", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "57ecaf106f00fad602c313e0629dea00df5da408", 
+    "revision": "57c31aebba1b708256c0741d590888b7bbaf1504", 
     "repo_path": "integration/gaia-central"
 }