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

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https://hg.mozilla.org/integration/gaia-central/rev/4a07bce4cd6b
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Bug 1059448 - Depend on marionette_client 0.8.3 and bump version of gaiatest to 0.27, r=zac

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https://hg.mozilla.org/integration/gaia-central/rev/526b33fd4e06
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #23211 from gmarty/Bug-1056965-Status-Bar-Layout-Spacing-Adjustments

Bug 1056965 - [Status Bar] Layout/Spacing Adjustments

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https://hg.mozilla.org/integration/gaia-central/rev/4304695ff974
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1056965 - [Status Bar] Layout/Spacing Adjustments

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https://hg.mozilla.org/integration/gaia-central/rev/02de44fecdbd
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1059678 - Provide a sensible default timeout for wait_for_b2g_ready. r=zcampbell

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "0a5c7375b5ad008e679385883350d887c2543c98", 
+    "revision": "4a07bce4cd6b25d48a1fcce3a2f96492c0e2f2d3", 
     "repo_path": "/integration/gaia-central"
 }