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

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https://hg.mozilla.org/integration/gaia-central/rev/4baa26a4ad68
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #26031 from zacc/bug_1096928_pt2

Bug 1096928 - Address intermittent in test_add_contact_to_favorites.py

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https://hg.mozilla.org/integration/gaia-central/rev/a6d1d63eefad
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1096928 - Address intermittent in test_add_contact_to_favorites.py

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https://hg.mozilla.org/integration/gaia-central/rev/a861e8da16f9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25013 from KevinGrandon/bug_1080905_rename_system

Bug 1080905 - [System] Rename System to Service r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/212311178f17
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1080905 - [System] Rename System to Service r=alive

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "3a50d107634e41f3a894814bc247b81d80f4a146", 
+    "revision": "4baa26a4ad68192f712b7a6144e682a3ead216fe", 
     "repo_path": "integration/gaia-central"
 }