Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/6b754b3426ae
Author: Rudy Lu <left.lu@gmail.com>
Desc: Merge pull request #10959 from RudyLu/keyboard/swipe_hide_keyboard_3

Bug 805586 - support "Swipe down" to hide the keyboard. r=janjongboom

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https://hg.mozilla.org/integration/gaia-central/rev/8bd9295f0f68
Author: Rudy Lu <left.lu@gmail.com>
Desc: Bug 805586 - Support "Swipe down" gesture to hide the keyboard.

1. To fix the issue that keyboard may ignore all touch event after swipe
down.
2. Also change from asyncStorage to mozSettings to keep ftu.enabled, so
that we could disable it when doing automated testing of keyboard.

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "e8ded466224d1b36d5ba4b62adf38a4d17da0a73", 
+    "revision": "6b754b3426aed0e947fa64a1e6baa89002db384e", 
     "repo_path": "/integration/gaia-central"
 }