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

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https://hg.mozilla.org/integration/gaia-central/rev/c1474e9b2766
Author: Borja Salguero <borjasalguero@users.noreply.github.com>
Desc: Merge pull request #14396 from jmcanterafonseca/fix_sms_fb_photos

Bug 907740 - [messages] sending message to Facebook contacts results in ...

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https://hg.mozilla.org/integration/gaia-central/rev/ec4a4e09026a
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 907740 - [messages] sending message to Facebook contacts results in phone number not contact name being displayed

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https://hg.mozilla.org/integration/gaia-central/rev/d3bb7d41cacc
Author: Trif Andrei-Alin <trifandreialin@gmail.com>
Desc: Merge pull request #14823 from bobsilverberg/video_frames

Bug 937336 - Remove where possible explicit frame switching

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https://hg.mozilla.org/integration/gaia-central/rev/510c0bfeecb3
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 937336 - Remove where possible explicit frame switching

Remove explicit frame switching *and* unneeded locators from videoplayer app

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "2fa554a9d4ab5f268e5844a814525758cfe0a1bc", 
+    "revision": "c1474e9b276699c6ecb2d6336e9e3f27dbb46cc3", 
     "repo_path": "/integration/gaia-central"
 }