Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/25ef0efcc8cf
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15787 from KevinGrandon/bug_960250_to_master

Bug 960250 - Show app titles in status bar

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https://hg.mozilla.org/integration/gaia-central/rev/ca2f1cadd156
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 960250 - Show app titles in status bar r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/1c16e3927bdf
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #15656 from arcturus/bug-962215

Bug 962215 - [B2G][Contacts]Unable to import contacts from the SD card.

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https://hg.mozilla.org/integration/gaia-central/rev/df981ce193c4
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 962215 - [B2G][Contacts]Unable to import contacts from the SD card.

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https://hg.mozilla.org/integration/gaia-central/rev/b89bbd4ec3ea
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #15679 from arcturus/bug-957338

Bug 957338 - [Contacts] When viewing contact details from the Messages app (via Activity) the chat icon is not functional and not disabled either

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https://hg.mozilla.org/integration/gaia-central/rev/2d25b8b0149d
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 957338 - [Contacts] When viewing contact details from the Messages app (via Activity) the chat icon is not functional and not disabled either

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "59b5a02037681d451ea4db5afe49f9b1935e1aea", 
+    "revision": "25ef0efcc8cf4db9f56705da2e4e2623b2839edb", 
     "repo_path": "/integration/gaia-central"
 }