Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/c835685c32c2
Author: Yi-Fan Liao <yliao@mozilla.com>
Desc: Merge pull request #30151 from begeeben/1163507_style_dashboard_app_background

Bug 1163507 - [Stingray] Style dashboard app background, r=rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/13cd8af78a4c
Author: Yi-Fan Liao <begeeben@gmail.com>
Desc: Bug 1163507 - [Stingray] Style dashboard app background

* Set widget panel dimensions.
* Implement background parallax effect.

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https://hg.mozilla.org/integration/gaia-central/rev/766a492a3c2b
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #30153 from alivedise/bugzilla/1166591/leak-browser-iframe

Bug 1166591 - Drop browser element ref when app is suspended

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https://hg.mozilla.org/integration/gaia-central/rev/4d7b50c2af42
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1166591 - Drop browser element ref when app is suspended

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "6fa6da150c71a18a274da87a06b1c88e7b7db33f", 
+        "git_revision": "f00f5b7f456c213edd8a6c7ad0f9140797a0f9eb", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "9efe10b9adbef91949eb91f0386e4bc2a7923259", 
+    "revision": "c835685c32c2e56f30a9cd69971092561dd1baf3", 
     "repo_path": "integration/gaia-central"
 }