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

========

https://hg.mozilla.org/integration/gaia-central/rev/c7a34ae95f67
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #16667 from pivanov/bug-949024

Bug 949024 - Update Branded Wallpapers Sizes for v.1.4

========

https://hg.mozilla.org/integration/gaia-central/rev/11cfc3fcb2a0
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 949024 - Update Branded Wallpapers Sizes for v.1.4

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "branch": "", 
         "revision": ""
     }, 
-    "revision": "566953ef93e6cd8ba592ea2f264b38a7bda4cf53", 
+    "revision": "c7a34ae95f67bef811de5c8514142908fe056f51", 
     "repo_path": "/integration/gaia-central"
 }