Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/9f4c15388740
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #14687 from askeing/950563

Bug 950563 - Xfail test_gallery_crop_photo.py

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https://hg.mozilla.org/integration/gaia-central/rev/78737c415315
Author: askeing <askeing@gmail.com>
Desc: Bug 950563 - Xfail test_gallery_crop_photo.py

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https://hg.mozilla.org/integration/gaia-central/rev/aa3243adfb63
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #14640 from askeing/949550

Bug 949550 - Fix videoplayer tests

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https://hg.mozilla.org/integration/gaia-central/rev/be6ce15139db
Author: askeing <askeing@gmail.com>
Desc: Bug 949550 - Fix videoplayer tests

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "ad2ea4225c7979b07ce8731b3d62e88b2c9ef97c", 
+    "revision": "9f4c153887405667d695fc484741bcb1d58707b5", 
     "repo_path": "/integration/gaia-central"
 }