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

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https://hg.mozilla.org/integration/gaia-central/rev/dd7e652b0746
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #27649 from eeejay/bug-1069004

Bug 1069004 - Make brightness slider accessible. r=pdahiya

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https://hg.mozilla.org/integration/gaia-central/rev/e6ff7b6eaf16
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1069004 - Make brightness slider accessible.

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https://hg.mozilla.org/integration/gaia-central/rev/fc0fa6a85114
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1133720 - merge pull request #28280 from KevinGrandon:bug_1133720_migrate_test_shared_css_app to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/bcf8063986ed
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1133720 - Remove test test-shared-css app from dev_apps folder

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "fed55d3d89a5cad04a5c30dc6539933fd6577715", 
+        "git_revision": "1c2fb4e76bc879cbb85c2390b8dc7456b3a8e478", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "1ea143a3abdfd98032bd631493fa61c104d636d9", 
+    "revision": "dd7e652b0746a8e7354a8794d61899f9bc74888f", 
     "repo_path": "integration/gaia-central"
 }