Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/e4ab19024fdb
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22579 from mozilla-b2g/revert-22394-Bug1046554

Revert "Bug1046554 - B2G NFC: pass NFCPeerEvent in onpeerready"

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https://hg.mozilla.org/integration/gaia-central/rev/f1bb1338b084
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug1046554 - B2G NFC: pass NFCPeerEvent in onpeerready"

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https://hg.mozilla.org/integration/gaia-central/rev/c7e57d826840
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1046554 - Follow-up, fix linter issues r=me"

This reverts commit 25701a4f9fc4bd1d1dc4a1d4bedfe66ee8c94502.

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https://hg.mozilla.org/integration/gaia-central/rev/970179885d4a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1046554 - Follow-up, fix linter issues r=me

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ac620baf38865a64ffdf316790be67d2297718d4", 
+    "revision": "e4ab19024fdb3b126bef28f7b9d46d539bbc2482", 
     "repo_path": "/integration/gaia-central"
 }