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

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https://hg.mozilla.org/integration/gaia-central/rev/1b925f085b73
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #28165 from rexboy7/1132324-relaunch-presentation

Bug 1132324 - [Stingray][System] Kill previous app properly when re-launch presentation. r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/ebfdc84fafcf
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 1132324 - [Stingray][System] Kill previous app properly when re-launch presentation

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https://hg.mozilla.org/integration/gaia-central/rev/5427b822e342
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1132819 - merge pull request #28206 from RickyChien:bug-1132819 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/07bbe30cc359
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 1132819 - Upgrade jshint to 2.6.0 for supporting missing mocha keyword

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "eb91f9538a71b5e99558a9b6f49c758ac94bc776", 
+        "git_revision": "ce07add98ce9f7cca9257f8a64982e6f97cd2d65", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "c63f3e1d5f23b21a5dee8a40996754fdad474326", 
+    "revision": "1b925f085b737775e751bdc4594ca280dc00a846", 
     "repo_path": "integration/gaia-central"
 }