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

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https://hg.mozilla.org/integration/gaia-central/rev/ad374a0e32ed
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #28472 from gaye/bug-1129937

Bug 1129937 - VERBOSE=1 is broken

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https://hg.mozilla.org/integration/gaia-central/rev/2bcecbf34edf
Author: gaye <gaye@mozilla.com>
Desc: Bug 1129937 - VERBOSE=1 is broken

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https://hg.mozilla.org/integration/gaia-central/rev/0a110d174b5b
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1135805 - merge pull request #28417 from yzen:bug-1135805 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/76bb44d6becc
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1135805 - making chrome urlbar visible to the screen reader only when it is dragging or dragged to a minimized-tray in full screen apps.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "6f75d03f62d28e9e2d176e05cdcf794df789374c", 
+        "git_revision": "40ba3b4a6dc8f139978c606bcff95b915ed66b0e", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "e88bba2e60cdcd699f620af21b30e30ce3c77bf2", 
+    "revision": "ad374a0e32ed820c3376249e43eab881e01e1eaf", 
     "repo_path": "integration/gaia-central"
 }