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

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https://hg.mozilla.org/integration/gaia-central/rev/cfb223aa835d
Author: Luke Chang <luke-chang@users.noreply.github.com>
Desc: Merge pull request #33695 from kilikkuo/viewport

Bug 1229490 - Modify TV preferences to provide better web experience on large screen, r=kats

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https://hg.mozilla.org/integration/gaia-central/rev/5725a8487ff4
Author: Kilik Kuo <kikuo@mozilla.com>
Desc: Bug 1229490 - Set apz.allow_zooming=true & browser.viewport.desktopWidth=1920 to provide better web experience on large screen. r=kats.

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https://hg.mozilla.org/integration/gaia-central/rev/647e2f311c07
Author: Scott Wu <scottwu@mozilla.com>
Desc: Merge pull request #33665 from scottwu/835497-display-brightness-slider

Bug 835497 - Brightness gets adjusted as slider is being moved, r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/45119ac3652f
Author: Scott Wu <scottcwwu@gmail.com>
Desc: Bug 835497 - Brightness gets adjusted as slider is being moved

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "bf44b3161e9a62f78f0f8aca49a43bc66e69f680", 
+        "git_revision": "1899109c9fd9b9e2244155c4b9e966c0a48368fc", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "3601ee35badf665b736c02773dc465949f19ce4e", 
+    "revision": "cfb223aa835d5bf17ec0fd03f873b6788a149edb", 
     "repo_path": "integration/gaia-central"
 }