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

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https://hg.mozilla.org/integration/gaia-central/rev/b9be3efc55d0
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1134995 - merge pull request #28896 from ADLR-es:vcard-button-text to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/4f904a8abf79
Author: Adrián de la Rosa <adriantovick@gmail.com>
Desc: Bug 1134995 - [Contacts] [vcard] Visual tweaks for the multiple contact vcard import view

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https://hg.mozilla.org/integration/gaia-central/rev/3a5fc13ec1be
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1143203 - merge pull request #28918 from KevinGrandon:bug_1143203_pb_splash_page to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/f8de707ef31e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1143203 - [Private Browsing] Update the private browsing start page ui-r=epang r=kgrandon

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "14e78db52fe2a07733e643eaf3aeb558360ac554", 
+        "git_revision": "d5fb945b48069a6745c60617e3203e3f9ca3ea01", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "aac8d6c7c3fef31070ab72a445d4ccdd10b9226f", 
+    "revision": "b9be3efc55d074d39f155fa975fa10bfa1b58489", 
     "repo_path": "integration/gaia-central"
 }