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

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https://hg.mozilla.org/integration/gaia-central/rev/76c556f31dcb
Author: Rob Wood <rwood@mozilla.com>
Desc: Merge pull request #30882 from rwood-moz/bug1176237

Bug 1176237 - Reduce raptor variance

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https://hg.mozilla.org/integration/gaia-central/rev/76057ed975d2
Author: Rob Wood <rwood@mozilla.com>
Desc: Bug 1176237 - Reduce raptor variance

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https://hg.mozilla.org/integration/gaia-central/rev/e6975a85357e
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #30757 from wilsonpage/1177250

Bug 1177250 - [Video] Video's made on the Spark/Aries device do not work on Flame device

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https://hg.mozilla.org/integration/gaia-central/rev/e0fcd0084c31
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1177250 - [Video] Video's made on the Spark/Aries device do not work on Flame device

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "26003f00c5d527d780f8e6d417ebc966e19f24be", 
+        "git_revision": "c2c798dd2faadc49c5440abaa60fb2ea3f57113f", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "b93fbf2142c66924c99ff5ca4deac04d1cdaf3d9", 
+    "revision": "76c556f31dcbe9e77390aa71db867fd4f28aa70f", 
     "repo_path": "integration/gaia-central"
 }