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

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https://hg.mozilla.org/integration/gaia-central/rev/d3a070883e64
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1143902 - merge pull request #29077 from zbraniecki:1143902-populate-private-window-title-from-js to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/c2d3532656c2
Author: Zibi Braniecki <gandalf@mozilla.com>
Desc: Bug 1143902 - Move private browser title to JS to prevent FOUCs

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "34c45bb541621a006d39ce7441cbbdbf2b652e5e", 
+        "git_revision": "a275beb8cbf02df3b87c6b6dc2d35b90eb7b81b6", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "9d840e2937f7967faa8d8436b2307047e08f0844", 
+    "revision": "d3a070883e64f38603b26bfaae54ba949008e287", 
     "repo_path": "integration/gaia-central"
 }