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

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https://hg.mozilla.org/integration/gaia-central/rev/b1a91779e2d1
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Merge pull request #22130 from dmarcos/bug1043307

Bug 1043307 - Front camera image is rotated by 180 degree in landscape m...

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https://hg.mozilla.org/integration/gaia-central/rev/048932b4e72a
Author: Diego Marcos <diego.marcos@gmail.com>
Desc: Bug 1043307 - Front camera image is rotated by 180 degree in landscape mode

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "2e979b17dd56070922a70d520fa6e1da02605a9c", 
+    "revision": "b1a91779e2d1865a7964f8f11c038ab882aae244", 
     "repo_path": "/integration/gaia-central"
 }