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

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https://hg.mozilla.org/integration/gaia-central/rev/4baec44c8137
Author: Martijn <martijn.martijn@gmail.com>
Desc: Merge pull request #31741 from mwargers/1202664

Bug 1202664 - Potential NoSuchWindowException in view_image.tap_back_button in test_sms_with_picture_attached.py

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https://hg.mozilla.org/integration/gaia-central/rev/ed8e37bb2991
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1202664 - Potential NoSuchWindowException in view_image.tap_back_button in test_sms_with_picture_attached.py

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "1ebec25fa866bae69ef96367efcaf92ff1299a70", 
+        "git_revision": "9eb726e195574be30a9327f19a090a95de2041fb", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "904edc49b926651e87e9db94513cf9c63bfbaee5", 
+    "revision": "4baec44c8137ff4b639879687f609d439de240f1", 
     "repo_path": "integration/gaia-central"
 }