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

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https://hg.mozilla.org/integration/gaia-central/rev/400ec62f69bf
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #27660 from mnjul/bug_1125703_disable_kb_build_int_test

Bug 1125703 - Disable Gaia Keyboard Build Integration Tests until bug 1119731 is fixed

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https://hg.mozilla.org/integration/gaia-central/rev/07fab9430092
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1125703 - Disable Gaia Keyboard Build Integration Tests until bug 1119731 is fixed

- Disabled tests of GAIA_KEYBOARD_{PRELOAD_DICT_}LAYOUTS=* and GAIA_KEYBOARD_LAYOUTS=noPreloadDictRequired

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https://hg.mozilla.org/integration/gaia-central/rev/b3e8f2361286
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #27490 from mancas/bug1118854

Bug 1118854 - [Window Management][Homescreen] If the user taps home whil...

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https://hg.mozilla.org/integration/gaia-central/rev/15df87b235b5
Author: Manuel <manuel.casasbarrado@telefonica.com>
Desc: Bug 1118854 - [Window Management][Homescreen] If the user taps home while opening task manager, the homescreen will appear blank. r=sfoster

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "793773bb2944b42a85dd160049e605cbd880c4da", 
+        "git_revision": "bbe4036b0f00590fe70531ff00151408b45644f6", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "23aac85cce8d5d0435b7d5639e4ff6410c2dd121", 
+    "revision": "400ec62f69bf8c17cac35bd6733b9a7655c31577", 
     "repo_path": "integration/gaia-central"
 }