Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7d175461aafd
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #22893 from hfiguiere/bug1007774

Bug 1007774 - Part 2: fix undefined/null error found with hamachi. r=eli

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https://hg.mozilla.org/integration/gaia-central/rev/bbe1a855143d
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1007774 - Part 2: fix undefined/null error found with hamachi.

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https://hg.mozilla.org/integration/gaia-central/rev/f185a0428966
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #22832 from azasypkin/bug-1052442-activity-information-panel

Bug 1052442 - [sms] We should never close the activity when viewing the message report. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/fc914dbd721e
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1052442 - [sms] We should never close the activity when viewing the message report. r=julien

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "059efcddc7a746128e63262fbd752ca1ceee801f", 
+    "revision": "7d175461aafdd9e03e793105eec3c2386929715d", 
     "repo_path": "/integration/gaia-central"
 }