Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/179466c0aa4f
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Merge pull request #16208 from gabrielesvelto/bug-970879-prevent-redundant-listeners

Bug 970879 - Prevent redundant listeners from being registered during testing r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/dede21150390
Author: Gabriele Svelto <gsvelto@mozilla.com>
Desc: Bug 970879 - Prevent redundant listeners from being registered during testing r=julienw

- Refactored the WapPushManager object to not use bound functions for
  event listeners
- Modified the unit-tests to improve control over the document visibility

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https://hg.mozilla.org/integration/gaia-central/rev/496b052e2006
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #16173 from etiennesegonzac/bug-952797-reactivating-dialer-keypad-integration

Bug 952797 - Reactivating the dialer keypad integrations tests. r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/883e6b0baf4a
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 952797 - Reactivation the dialer keypad integrations tests.
(the marionette issue was fixed by bug 891882)

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https://hg.mozilla.org/integration/gaia-central/rev/85eba9390094
Author: Kartikaya Gupta <kgupta@mozilla.com>
Desc: Bug 970422 - Drop z-index of messages to go under the scrollbar. r=julien

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "1a7f19f338c81569b43bf45cf0a3579e11e36997", 
+    "revision": "179466c0aa4fd4d937a6d04d9cd136e687fa2993", 
     "repo_path": "/integration/gaia-central"
 }