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

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https://hg.mozilla.org/integration/gaia-central/rev/1f74ed6d8d91
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #16017 from vsireesha246/Bug_922609_Dispatching_Video_Scan_End_Event

[Video]Bug_922609_Provide a way for tests to determine that the video app has f... r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/fc9bd0603043
Author: varada.sireesha <varada.sireesha@lge.com>
Desc: Bug_922609_Provide a way for tests to determine that the video app has finished scanning

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "5db3ae28ac3a44dd2c08c41732758cdf4e7116f2", 
+    "revision": "1f74ed6d8d9197547cb2e3b1e1e8e65f1c01c8a9", 
     "repo_path": "/integration/gaia-central"
 }