Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/1ca58aadbcd5
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #11501 from punamdahiya/Bug_901410

[Gallery]- Bug 901410 - Fix of setting img src as null triggers error r=davidflanagan

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https://hg.mozilla.org/integration/gaia-central/rev/38716c0d2ed6
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: [Gallery]- Bug 901410 - Fix of setting img src as null triggers error r=davidflanagan

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "10a9cab9cf34cc34b34e1ee2c83ba2bf0af6d6f1", 
+    "revision": "1ca58aadbcd53835a9760347c70ee50c1a75f180", 
     "repo_path": "/integration/gaia-central"
 }