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

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https://hg.mozilla.org/integration/gaia-central/rev/64d5a983ba85
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1153522 - merge pull request #29556 from jrburke:bug1153522-email-compose-no-keyboard to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/2179ec51fea0
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1153522 - Unable to compose new email, no keyboard on body

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https://hg.mozilla.org/integration/gaia-central/rev/811b5a22d805
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1152230 - merge pull request #29463 from mikehenrty:bug-1152230-ellipses-sides to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/f6deb561f63c
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1152230 - Ensure ellipses is placed on proper side of notification body

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "0e1114306e4ddb5607fec487f1cf4ef97432e103", 
+        "git_revision": "bef174b279f8eff82b7a2d06414b0ccdd83dd06c", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "c88bdf4404e7cbdc0c75d16a77a48fc8fccbfc2c", 
+    "revision": "64d5a983ba85c1fee6ffc533abdd696b36ca1405", 
     "repo_path": "integration/gaia-central"
 }