Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6e58351010a7
Author: Ed Morley <emorley@mozilla.com>
Desc: Revert "Bug 1074909 - Only display loaded favicons. r=kgrandon" for test timeouts

This reverts commit 03b59751d60912dce55198968c988abc00c2c15b.

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https://hg.mozilla.org/integration/gaia-central/rev/179390f14a18
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #24430 from bebef1987/xfail_video1

Bug 1072913 - Disable test_play_3gp_video until Bug 1050667 is fixed

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https://hg.mozilla.org/integration/gaia-central/rev/2ab16a27fd6a
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1072913 - Disable test_play_3gp_video until Bug 1050667 is fixed

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "dea326fd3893016b23611d87035dabade874f6cf", 
+    "revision": "6e58351010a721fa3cfb35ae22d124c9b80bffe4", 
     "repo_path": "/integration/gaia-central"
 }