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

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https://hg.mozilla.org/integration/gaia-central/rev/5ad861b50d5f
Author: Martijn <martijn.martijn@gmail.com>
Desc: Merge pull request #31884 from mwargers/1205626

Bug 1205626 - Add a check that the private browser window is ready as a workaround for bug 1204831

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https://hg.mozilla.org/integration/gaia-central/rev/d3f6c51c4fe7
Author: Martijn Wargers <mwargers@mozilla.com>
Desc: Bug 1205626 - Add a check that the private browser window is ready as a workaround for bug 1204831

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https://hg.mozilla.org/integration/gaia-central/rev/0fc9931f58de
Author: No-Jun Park <npark@mozilla.com>
Desc: Merge pull request #31895 from npark-mozilla/1205742-2

Bug 1205742 - Imagecompare: update manifest.ini for RTL so it'll pick…

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https://hg.mozilla.org/integration/gaia-central/rev/00d459b2a02a
Author: No-Jun Park <npark@mozilla.com>
Desc: Bug 1205742 - Imagecompare: update manifest.ini for RTL so it'll pick SIM-enabled devices with SD card

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "42b564dac8c7b2fea6a02c55005e7547b0101c7c", 
+        "git_revision": "750334a998ffc4b2d29fbd04e394d8cdd14fd29c", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "ba77d8a2901886f8c0c5191eec7edb52c23f5f64", 
+    "revision": "5ad861b50d5f2c824a606d1d3fc1632e732ef9a4", 
     "repo_path": "integration/gaia-central"
 }