Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/18a7681ac7c7
Author: BavarianTomcat <tomcat@mozilla.com>
Desc: Revert "Bug 1107139 - Show id-overlay when there's no screenshot. r=etienne" for conflicting with mozilla-inbound

This reverts commit b59f8b0.

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https://hg.mozilla.org/integration/gaia-central/rev/56696c9032c1
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #28877 from yuwen41200/master

Bug 1141971 - [Privacy Controls] fix remaining words, r=marta

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https://hg.mozilla.org/integration/gaia-central/rev/da19d6ef4a58
Author: yuwen41200 <yuwen41200@gmail.com>
Desc: Rename remaining 'privacy panel' to 'privacy controls'

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "1bd1a1bd950e1d5c2dea30a84d9ce42cfd50802b", 
+        "git_revision": "b8051d370ddf4e5bd8e7d8a19fb9eeb5fd6ffb39", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "7e3ce02dd9c52f773a7245bf9a11f86652ced64e", 
+    "revision": "18a7681ac7c78cd21cc22de6ea1746fcab1c2f62", 
     "repo_path": "integration/gaia-central"
 }