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

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https://hg.mozilla.org/integration/gaia-central/rev/ddb07ccd70c0
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1135692 - merge pull request #28364 from npark-mozilla:1135692 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/780f61f5fd52
Author: No-Jun Park <npark@mozilla.com>
Desc: Bug 1135692 - adding imagecompare test case that changes wallpaper using the gallery image

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https://hg.mozilla.org/integration/gaia-central/rev/18aa0bed06d4
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1135747 - merge pull request #28371 from autra:bug-1135747 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/871e27a49726
Author: Augustin Trancart <augustin.trancart@phoxygen.com>
Desc: Bug 1135747 - The big letters when touching the contact list scrollbar were outside of the screen

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "024134d719127257a6e5a73b6fe86ff2d15657c2", 
+        "git_revision": "c969ba09b4ce1dc8e424889205720d7df0cc1012", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "4195fc75864d8978687d0d8d73f3e4dd5a69cbf9", 
+    "revision": "ddb07ccd70c01105eabf5db592ddbe3922954b82", 
     "repo_path": "integration/gaia-central"
 }