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

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https://hg.mozilla.org/integration/gaia-central/rev/cb0a474452f1
Author: Ricky Chien <rickychien@users.noreply.github.com>
Desc: Merge pull request #31556 from rickychien/b2g-43

Bug 1146713 - Upgrade to b2g 43.0a1 r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/eb9ce27f2860
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 1146713 - Upgrade to b2g 43.0a1

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "4d8aeb0c301250f3696dda44a8518c70d9ac196a", 
+        "git_revision": "7d915992b2e1bde8cb64906a2b83280588dc923d", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "290173a08347ae15a958c9d6542c12cad3751818", 
+    "revision": "cb0a474452f1af38c3af0b55c36706390db60ddc", 
     "repo_path": "integration/gaia-central"
 }