Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8d6f3e60811e
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1074117 - Use expected conditions where appropriate and optimise element lookups in system app. r=dhunt

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https://hg.mozilla.org/integration/gaia-central/rev/74565432a4c9
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #27894 from crh0716/1118671

Bug 1118671 - Fix the incorrect selector r=eragonj

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https://hg.mozilla.org/integration/gaia-central/rev/d8fb7c0f4b7a
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1118671 - Fix the incorrect selector

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "c35c8e8d35ef8a2002a3b87fe333056c099775b0", 
+        "git_revision": "3912b4b5594688758c248f825020ed184df1e69f", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "cfac24aeca7d0f6e4a3f2f4a6dd10469d36b8ba0", 
+    "revision": "8d6f3e60811e0489df9f844ca341cab4e8401d61", 
     "repo_path": "integration/gaia-central"
 }