Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e7a3c2584d98
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #17416 from gasolin/issue-985341

Bug 985341 - Fix uitest-privileged for test_video_capture_prompt failure

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https://hg.mozilla.org/integration/gaia-central/rev/58599eb2770d
Author: gasolin <gasolin@gmail.com>
Desc: Bug 985341 - Fix uitest-privileged for test_video_capture_prompt failure

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https://hg.mozilla.org/integration/gaia-central/rev/d22ba20b0454
Author: BavarianTomcat <tomcat@mozilla.com>
Desc: Revert "Bug 999475 - Allows overloading SETTINGS_PATH with env variable. r=yurenju" for windows build bustage

This reverts commit d29edd82d3b34e38859137a748bfe708d7b520b0.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "96cfd90274a05fd15708f2a27d9a503b9c1164d9", 
+    "revision": "e7a3c2584d982e38182778a9551d6e0526031ba1", 
     "repo_path": "/integration/gaia-central"
 }