Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4da7d6e06cc0
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #16347 from steveck-chung/bug-972245

Bug 972245 - Photos can appear distorted in the call log and in the SMS(SMS part only), r=julienw.

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https://hg.mozilla.org/integration/gaia-central/rev/c2b4329d63c3
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 972245 - Photos can appear distorted in the call log and in the SMS app(SMS part)

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https://hg.mozilla.org/integration/gaia-central/rev/62a77fd8abf3
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #16233 from gasolin/issue-968682

Bug 968682 - [settings] add marionette test for Notifications panel, r=arthur&evan

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https://hg.mozilla.org/integration/gaia-central/rev/48a9a5fbcd6c
Author: gasolin <gasolin@gmail.com>
Desc: Bug 968682 - [settings] add marionette test for Notifications panel

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https://hg.mozilla.org/integration/gaia-central/rev/69fd6752d88f
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #16280 from timdream/system2-hardwarebuttons

Bug 971495 - [System2] Instantiable HardwareButtons, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/68986d8dbc32
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 971495 - [System2] Instantiable HardwareButton

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "16d0fa02d9f3d338d0d916ad02a32f463ce2cbe3", 
+    "revision": "4da7d6e06cc0fdf293bd99a993e43186f55bc799", 
     "repo_path": "/integration/gaia-central"
 }