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

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https://hg.mozilla.org/integration/gaia-central/rev/d7643b0dfd7a
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #15450 from yurenju/no-compression

Bug 957497 - Allow include of uncompressed data files in the package apps r=@timdream

========

https://hg.mozilla.org/integration/gaia-central/rev/d0baa7bbed35
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 957497 - Allow include of uncompressed data files in the package apps

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "8754e2ededd46e68ff087c96a97f038612cfef74", 
+    "revision": "d7643b0dfd7a670658780952587f95e20b251fc3", 
     "repo_path": "/integration/gaia-central"
 }