Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/89d027656c60
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #16609 from EverythingMe/bug-975917

Bug 975917 - [Everything.me] Tapping homebutton while in Collection Rena...

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https://hg.mozilla.org/integration/gaia-central/rev/851a7258826c
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 975917 - [Everything.me] Tapping homebutton while in Collection Rename mode may cause freeze [r=ranbena]

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "8bb5b636e08b972e192891a583bcef98300efe00", 
+    "revision": "89d027656c60ec857c54f580c97a94fdc7322f25", 
     "repo_path": "/integration/gaia-central"
 }