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

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https://hg.mozilla.org/integration/gaia-central/rev/dd53699bff64
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #31141 from nullaus/bug1188648

Bug 1188648 - Always use --host-log to save gecko output to gecko-out…

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https://hg.mozilla.org/integration/gaia-central/rev/2f0e49d121e0
Author: Ghislain 'Aus' Lacroix <aus@mozilla.com>
Desc: bug 1188648 - Always use --host-log to save gecko output to gecko-output.log. r=gaye

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "4b1b185afde3bc3bebf3467ef9e257adc46fc58e", 
+        "git_revision": "494d8169d36ee497d3e2111c839382dde5ebaeba", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "ed8a062b394d073eea962d106e832d749d8e409c", 
+    "revision": "dd53699bff645f26ee45d721da7b6852e2d71cfb", 
     "repo_path": "integration/gaia-central"
 }