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

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https://hg.mozilla.org/integration/gaia-central/rev/6b8f72fc133b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22587 from KevinGrandon/bug_1049678_wc_text_content

Bug 1049678 - [GaiaGrid] Remove textContent workaround

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https://hg.mozilla.org/integration/gaia-central/rev/ef49448d1ede
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1049678 - [GaiaGrid] Remove textContent workaround r=wilsonpage

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "cffb8e7efe8a20181c00289e2d027326702c460c", 
+    "revision": "6b8f72fc133bcfe4cf58a133a2f5e24ae2c25ad6", 
     "repo_path": "/integration/gaia-central"
 }