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

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https://hg.mozilla.org/integration/gaia-central/rev/d7535846f19d
Author: gitmai <mri@tid.es>
Desc: Merge pull request #20100 from gitmai/bug-1007590-CC-remove-balance-sms

Bug 1007590 - [Cost Control] Make Cost Control to remove balance and top...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/44c770cb1ed1
Author: mai <mri@tid.es>
Desc: Bug 1007590 - [Cost Control] Make Cost Control to remove balance and top-up SMS responses

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https://hg.mozilla.org/integration/gaia-central/rev/0cd3c4c23e35
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19949 from rnowm/power-modal-object

Bug 973827 - Power button modal should be an object menu instead of a custom implementation r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/81b25082bc79
Author: rnowm <arnau@arnaumarch.com>
Desc: Bug 973827 - Power button modal should be an object menu instead of a custom implementation

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https://hg.mozilla.org/integration/gaia-central/rev/7de232eb5e82
Author: Albert <acperez@tid.es>
Desc: Merge pull request #19996 from acperez/bug-1020167

Bug 1020167: Add search engine configuration based on MCC/MNC

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https://hg.mozilla.org/integration/gaia-central/rev/9848cad039b1
Author: Albert <acperez@tid.es>
Desc: Bug 1020167: Add search engine configuration based on MCC/MNC

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "a54c3cd4cf9154e20175fa7e8ac05f8d569993d5", 
+    "revision": "d7535846f19d63bd1fbee8cf348b80a0823e5fd1", 
     "repo_path": "/integration/gaia-central"
 }