Bumping gaia.json for 8 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/9f9c218192ee
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #24947 from gmarty/Bug-1078727-GPS-icon-status-bar-can-sometimes-take-30-60-seconds-update

Bug 1078727 - GPS icon in status bar can sometimes take 30–60 seconds to...

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https://hg.mozilla.org/integration/gaia-central/rev/881758f0605d
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1078727 - GPS icon in status bar can sometimes take 30–60 seconds to update in B2G 2.1

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https://hg.mozilla.org/integration/gaia-central/rev/b1ced749749c
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #24893 from gmarty/Bug-1068470-soft-home-button-SHB-missing-when-lockscreen-is-on-and-there-is-an-incoming-call

Bug 1068470 - [soft-home-button] SHB missing when lockscreen is on, and there is an incoming call

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https://hg.mozilla.org/integration/gaia-central/rev/c4d4cefebf45
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1068470 - [soft-home-button] SHB missing when lockscreen is on, and there is an incoming call

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https://hg.mozilla.org/integration/gaia-central/rev/69ce9411f265
Author: Fabrice Desré <fabrice@desre.org>
Desc: Merge pull request #24982 from sudheesh001/Patch_1061533

Bug 1061533 Fixes jshint error in tests/js-marionette/helper.js r=fabrice

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https://hg.mozilla.org/integration/gaia-central/rev/6acf3982cd4a
Author: sudheesh001 <sudheesh1995@outlook.com>
Desc: Bug 1061533 Fixes jshint error in tests/js-marionette/helper.js

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https://hg.mozilla.org/integration/gaia-central/rev/7b031c752658
Author: punamdahiya <punamdahiya@yahoo.com>
Desc: Merge pull request #23237 from ranjithgithub/1050129_DeleteSingleFileIsSlow

Bug-1050129 [Gallery] Single file delete delay fix r=pdahiya

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https://hg.mozilla.org/integration/gaia-central/rev/f999965fa2ea
Author: ranjith.gutha <ranjith.gutha@lge.com>
Desc: Bug-1050129 [Gallery] Single file delete delay fix

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ab9466a85acc108164bc17b9064387142b82d4da", 
+    "revision": "9f9c218192ee99edaefc8c1416139b7f6e96a90b", 
     "repo_path": "/integration/gaia-central"
 }