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

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https://hg.mozilla.org/integration/gaia-central/rev/a8b0558060fc
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1151902 - merge pull request #29456 from mwargers:test_dialer_find_contact.py.diff to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/e1df763adb30
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1151902 - test_dialer_find_contact.py: IndexError: list index out of range

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https://hg.mozilla.org/integration/gaia-central/rev/e92614f6b217
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1152669 - merge pull request #29418 from shamenchens:Bug1152669-FixJshintIdentity to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/451a25fc909e
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 1152669 - Fix jshint error in identity and remove from xfail.list

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "25126ee25ffc9d46c2cba96dd2bf64fb63c67b8d", 
+        "git_revision": "3c68964cb9fdba7cf0f6829b7f44562acaf1f1d7", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "13e7783ef0a3f6183dee9c22eac675475702e4aa", 
+    "revision": "a8b0558060fc7033bd1a667544f74387c5e08a58", 
     "repo_path": "integration/gaia-central"
 }