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

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https://hg.mozilla.org/integration/gaia-central/rev/6ea215d6a4d1
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 954712 - [Messages] Hide subject field when input is empty and user taps backspace r=julienw

https://bugzilla.mozilla.org/show_bug.cgi?id=954712
Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

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https://hg.mozilla.org/integration/gaia-central/rev/7395ba5bf3fc
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #15642 from crdlc/bug-958939

Bug 958939 - [OTA][Helix] The items added in home screen are missing whe...

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https://hg.mozilla.org/integration/gaia-central/rev/174832c58949
Author: crdlc <crdlc@tid.es>
Desc: Bug 958939 - [OTA][Helix] The items added in home screen are missing when device updates from v1.2 to v1.3

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https://hg.mozilla.org/integration/gaia-central/rev/cd1a0186d308
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #15564 from Rik/962123-second-tap

Bug 962123 - Taping on the contact tab a second time should send us to t... r=etienne r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/a40b12adf63a
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Bug 962123 - Taping on the contact tab a second time should send us to the list view

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "7831dcded4df7359debd3ac99b5867d4e896c719", 
+    "revision": "6ea215d6a4d1c7edee492fc4ae462115c5d9808e", 
     "repo_path": "/integration/gaia-central"
 }