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

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https://hg.mozilla.org/integration/gaia-central/rev/68f78bcc8c51
Author: Martijn <martijn.martijn@gmail.com>
Desc: Merge pull request #31354 from mwargers/1194676

Bug 1194676 - self.apps = GaiaApps(marionette) line can be removed in gaia_test.py

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https://hg.mozilla.org/integration/gaia-central/rev/a229ea23bd18
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1194676 - self.apps = GaiaApps(marionette) line can be removed in gaia_test.py

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https://hg.mozilla.org/integration/gaia-central/rev/493c85542777
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #31341 from julienw/1192754-navigation-add-aria-hidden

Bug 1192754 - Add aria-hidden=true to hidden panels r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/5e6760b79f2f
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1192754 - Add aria-hidden=true to hidden panels r=azasypkin

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "f238f27860f734db255f0184b4b31015effea4f2", 
+        "git_revision": "dd50945885765697f9fad93e05f6d8c78e1d742c", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "fcd338edcce5a87e01d47f18b4e9a414fb4cbbe4", 
+    "revision": "68f78bcc8c51fea5242ba041b3b107e3acbfa4ac", 
     "repo_path": "integration/gaia-central"
 }