Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6f7c16a1f9c5
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #25201 from mikehenrty/bug-1082071-unlock-trigger-resize

Bug 1082071 - Make unlocking screen trigger system resize when SHB enabl...

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https://hg.mozilla.org/integration/gaia-central/rev/a9bc337e9c31
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1082071 - Make unlocking screen trigger system resize when SHB enabled

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ad1884a1465c7c790b449acc352de553d868548b", 
+    "revision": "6f7c16a1f9c59f424552c0b7824fd10c82d417e6", 
     "repo_path": "/integration/gaia-central"
 }