Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/c64bab0a2de7
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1106229 - merge pull request #26567 from KevinGrandon:bug_1106229_remove_strings_modal_dialogs to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/108dff300374
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1106229 - Remove strings from index.html for modal dialogs r=kgrandon

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "cec6afa012f858064959951f943fe1182bb17ce6", 
+    "revision": "c64bab0a2de7c59353ca46a5bd347595fc87117c", 
     "repo_path": "integration/gaia-central"
 }