Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/643dbb1c26d3
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #26006 from Cwiiis/bug1082675-app-grouping-by-default

Bug 1082675 - Enable homescreen app-grouping permanently. r=kgrandon,crdlc

========

https://hg.mozilla.org/integration/gaia-central/rev/01889de35710
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1082675 - Fix divider->group related marionette test failures. r=crdlc,kgrandon

Some assumptions made by marionette tests no longer hold after enabling
app-grouping by default:

- Long-pressing a divider no longer brings up the context menu
- The divider element itself is not positioned (its children are)

========

https://hg.mozilla.org/integration/gaia-central/rev/89e940eb62b0
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1082675 - Enable homescreen app-grouping permanently. r=kgrandon,crdlc

This reverts commit 071efd0eb9d962d4f96edc28d672e48910f48387.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "24c69552568a3d980b3f3f5bb47aaca896646b83", 
+    "revision": "643dbb1c26d37d6162548222dd790c23206c8d25", 
     "repo_path": "integration/gaia-central"
 }