Bumping gaia.json for 9 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b4199210d025
Author: Arthur Chen <crh0716@gmail.com>
Desc: Revert "Bug 986846 - [settings] additional white space next to 'privacy policy' link in page about crash reports. r=evelyn"

This reverts commit b49429f4cacb8085d2bc420d83c094aeda404e88.

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https://hg.mozilla.org/integration/gaia-central/rev/bfe353ceab6c
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #17736 from snowmantw/issue960915-emergencycall-as-app

Bug 960915 - (emergencycall-as-app) [LockScreen][EmergencyCall] Make EmergencyCall as an app

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https://hg.mozilla.org/integration/gaia-central/rev/c6594812c57a
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 960915 - (emergencycall-as-app) [LockScreen][EmergencyCall] Make EmergencyCall as an app

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https://hg.mozilla.org/integration/gaia-central/rev/e9252eabc9e3
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #17726 from wilsonpage/bug/988441

Bug 988441 - [Camera][Madai][Mozilla][UX] 1.4 Image Preview text should ...

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https://hg.mozilla.org/integration/gaia-central/rev/814a58f08aa7
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 988441 - [Camera][Madai][Mozilla][UX] 1.4 Image Preview text should match confirmation text

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https://hg.mozilla.org/integration/gaia-central/rev/5ca22fd42436
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #17712 from wilsonpage/bug/988484

Bug 988484 - [Camera] HUD blinks on startup

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https://hg.mozilla.org/integration/gaia-central/rev/7c7af40d809a
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 988484 - [Camera] HUD blinks on startup

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https://hg.mozilla.org/integration/gaia-central/rev/f96347ce24b2
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #17744 from ian-liu/system2/bug964653_system_dialog_refactor

Bug 964653 - (system-dialog) [Window Management] Implement System Dialog Window, r=@alivedise

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https://hg.mozilla.org/integration/gaia-central/rev/889510dbdaea
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 964653 - (system-dialog) [Window Management] Implement System Dialog Window

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "a1a693a02e5890bd7dc1d5f16c4d21cc17755462", 
+    "revision": "b4199210d025c3752a68b7791b501eba430cf883", 
     "repo_path": "/integration/gaia-central"
 }