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

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https://hg.mozilla.org/integration/gaia-central/rev/c78edffd4e1d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #29404 from KevinGrandon/bug_1152591_transition_variable

Bug 1152591 - [Shared] Add variables.css to contain gaia-wide CSS definitions

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https://hg.mozilla.org/integration/gaia-central/rev/64fe74689fae
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1152591 - [Shared] Add variables.css to contain gaia-wide CSS definitions r=dietrich

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "7414321345bfbd5347bd9d291fd0d10374db671f", 
+        "git_revision": "0e1475941690fa757509dd566c6b4644385037fa", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "eb731b9908de9de48fb0a062b535f375b2966827", 
+    "revision": "c78edffd4e1d1ff5ee5834359ad27cb0cf6b2178", 
     "repo_path": "integration/gaia-central"
 }