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

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https://hg.mozilla.org/integration/gaia-central/rev/70ab08a2dadc
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1157741 - merge pull request #29691 from KevinGrandon:bug_1157741_event_safety_scope to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/999da2100de7
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1157741 - Filter transitionend calls within eventSafety library r=etienne

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "e45b3895b12ba4dd1e723a342745a9a8b0042947", 
+        "git_revision": "b4c949cdc780893897c9b45c1adea46e2eb694ff", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "5a94154908da7fd1ef7ded3cd51619534fc851f8", 
+    "revision": "70ab08a2dadc6cf89a4d9579c3696517faf807b8", 
     "repo_path": "integration/gaia-central"
 }