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

========

https://hg.mozilla.org/integration/gaia-central/rev/cee7b9b5a430
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 879773 - Fix linter tests shame=rik

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https://hg.mozilla.org/integration/gaia-central/rev/d75f7659b62a
Author: Chris AtLee <catlee@mozilla.com>
Desc: Bug 852321: Update xulrunner SDK to reduce download time. r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/b4bafb96eb0b
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #10314 from RudyLu/gallery/Bug880943-correct_init

Bug 880943 - Correctly init Gallery app regardless of the timing of r=davidflanagan

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https://hg.mozilla.org/integration/gaia-central/rev/9528e6c2e59c
Author: Rudy Lu <left.lu@gmail.com>
Desc: Bug 880943 - Correctly init Gallery app regardless of the timing of
localized event.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "4740827fec69f2a87743d0e457a4fd64005fe88b", 
+    "revision": "cee7b9b5a430417658a48d3ceeb78271f34db6f7", 
     "repo_path": "/integration/gaia-central"
 }