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

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https://hg.mozilla.org/integration/gaia-central/rev/6601c645346c
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #17576 from Rik/sms-send-button-907103

Bug 907103 - [SMS] Don't close the keyboard when missing the send button r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/f90c1a071c2d
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 907103 - [SMS] Don't close the keyboard when missing the send button

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https://hg.mozilla.org/integration/gaia-central/rev/84ec451ea8b7
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #17653 from mcav/225

Bug 983075 - [MADAI][Clock] @2.25x assets update for Clock. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/60bd40c360eb
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 983075 - [MADAI][Clock] @2.25x assets update for Clock. r=jrburke

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "79b978feb7b7eb1da0bc3b4558eada00bf2c0639", 
+    "revision": "6601c645346c862df61de52d3c1c581275b0eb36", 
     "repo_path": "/integration/gaia-central"
 }