Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/0195bc779200
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #12197 from comoyo/revert_supportsswitching

Revert "Bug 912951 - Send content event from gaia -> chrome with layout info for supportsSwitching"

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https://hg.mozilla.org/integration/gaia-central/rev/55c54a9b22c1
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Revert "Bug 912951 - Send content event from gaia -> chrome with layout info for supportsSwitching"

This reverts commit 6c18cc2aa298247ab218c7222a8f32f1b3e29880.

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https://hg.mozilla.org/integration/gaia-central/rev/fb6ccb56b13d
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #12049 from davehunt/gaiatest-master

Bug 909718 - Add Gaia endurance tests (master)

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https://hg.mozilla.org/integration/gaia-central/rev/f63307130ec9
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 909718 - Add Gaia endurance tests (master)

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "58c319406b1c16d1286f471b727affcdcaf698b9", 
+    "revision": "0195bc779200b36cf2aa3e8dcd7d48633279f6e6", 
     "repo_path": "/integration/gaia-central"
 }