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

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https://hg.mozilla.org/integration/gaia-central/rev/f318fca4bcd9
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #30727 from gaye/bug-1177833

Bug 1177833 - Gaia shouldn't download b2g always r=aus

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https://hg.mozilla.org/integration/gaia-central/rev/1469f372de87
Author: gaye <gareth.aye@gmail.com>
Desc: Bug 1177833 - Gaia shouldn't download b2g always r=aus

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "a2c1e76319ee33ab85612448371cff8786799a63", 
+        "git_revision": "6e7fa235792a664f6467cb083318b13a0ce4e9af", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "815608fef9376b96eeffb5efa61ec8a1b7f01c4a", 
+    "revision": "f318fca4bcd9811fbf29dbc4b07e8e38ac724f67", 
     "repo_path": "integration/gaia-central"
 }