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

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https://hg.mozilla.org/integration/gaia-central/rev/d7b7f27aa999
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #24915 from DouglasSherk/1078663-dialer-withheld-voicemail

Bug 1078663 - Fix withheld numbers being displayed as voicemail within the call log. r=Rik

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https://hg.mozilla.org/integration/gaia-central/rev/c5e80c56b219
Author: Doug Sherk <github@sherk.me>
Desc: Bug 1078663 - Fix withheld numbers being displayed as voicemail within the call log. r=Rik

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https://hg.mozilla.org/integration/gaia-central/rev/692dc5d95de3
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #24984 from albertopq/1078911-bt-confirm

Bug 1078911 - SHB and inline activities on fullscreen_layout r=etienne_s

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https://hg.mozilla.org/integration/gaia-central/rev/0d75513091b4
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1078911 - SHB and inline activities on fullscreen_layout

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "11fbe6227e0be0b522882d1c3741e233566c7922", 
+    "revision": "d7b7f27aa9992e4f220f8eff6cae2998baa13d5a", 
     "repo_path": "/integration/gaia-central"
 }