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

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https://hg.mozilla.org/integration/gaia-central/rev/4752a0a930d5
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #20316 from DouglasSherk/1022746-dialer-call-log-apzc

Bug 1022746 - Remove requestAnimationFrame from FontSizeUtils to fix frames falling back to sync panning and zooming. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/67c31e91b752
Author: DouglasSherk <github@sherk.me>
Desc: Bug 1022746 - Remove requestAnimationFrame from FontSizeUtils to fix frames falling back to sync panning and zooming. r=vingtetun

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "1262a91272618ea996fbed6db19301fae5727a06", 
+    "revision": "4752a0a930d51fca56cb34d1ea69e4e369191b75", 
     "repo_path": "/integration/gaia-central"
 }