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

========

https://hg.mozilla.org/integration/gaia-central/rev/8b749da3986f
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #17755 from wilsonpage/bug/989295

Bug 989295 - [Camera] Fix SettingsController test breaking TBPL

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https://hg.mozilla.org/integration/gaia-central/rev/d17d42feab93
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 989295 - [Camera] Fix SettingsController test breaking TBPL

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "91070081da26df43ec5d5d00bbfdf36ea3d1c450", 
+    "revision": "8b749da3986f791934ba824cc7e7be0194381362", 
     "repo_path": "/integration/gaia-central"
 }