Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/2c9cefb46d22
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 977640 - Bump up timeout in test_sms_notification.py a=testonly r=me

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https://hg.mozilla.org/integration/gaia-central/rev/fa1e7c0cf799
Author: Albert <acperez@tid.es>
Desc: Merge pull request #16624 from acperez/bug-976008

Bug 976008 - Pre-polulate some WiFi SSID by SIM. r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/ff220573ee44
Author: Albert <acperez@tid.es>
Desc: Bug 976008 - Pre-polulate some WiFi SSID by SIM. r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/fa651a80f7dc
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #16677 from justindarc/bug977278

Bug 977278 - Fixed visible rotating thumbnails when Filmstrip is hidden by hiding overflow.

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https://hg.mozilla.org/integration/gaia-central/rev/4f6181b60cf8
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 977278 - Fixed visible rotating thumbnails when Filmstrip is hidden by hiding overflow.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "branch": "", 
         "revision": ""
     }, 
-    "revision": "58674c6684b493f1b6714ab3cf6b49600d445590", 
+    "revision": "2c9cefb46d22d2a0c5919e72b05aa4916b26484d", 
     "repo_path": "/integration/gaia-central"
 }