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

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https://hg.mozilla.org/integration/gaia-central/rev/8f2b2d0f56f6
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19062 from pacorampas/emergency-call-992915

Bug 992915 - [Emergency-call] Emergency call main dialer screen (keypad) visual refresh 2.0 r=me

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https://hg.mozilla.org/integration/gaia-central/rev/26d806f535b9
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 992915 - [Emergency-call] Emergency call main dialer screen (keypad) visual refresh 2.0

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "b2b97aa1abed8adf85253f9154a96f8b9ff8ea2a", 
+    "revision": "8f2b2d0f56f6d557a5297ac114812c2c1ed1e239", 
     "repo_path": "/integration/gaia-central"
 }