Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/1ab9e5d9915d
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #31512 from BorisChiou/Bug1121463

Bug 1121463 - Provide 'copy link/URL' option when long-pressing hyperlinks

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https://hg.mozilla.org/integration/gaia-central/rev/b2c0ede4dc68
Author: Boris Chiou <boris.chiou@gmail.com>
Desc: Bug 1121463 - Part 2: Add copy links/images marionette test

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https://hg.mozilla.org/integration/gaia-central/rev/6689ba8c1270
Author: Boris Chiou <boris.chiou@gmail.com>
Desc: Bug 1121463 - Part 1: Support copy links

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https://hg.mozilla.org/integration/gaia-central/rev/d096a1ceb620
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #31459 from CervantesYu/bug_1179353

Bug 1179353 - Implement a stable screen automatic brightness algorithm.

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https://hg.mozilla.org/integration/gaia-central/rev/bbff47caca1e
Author: Cervantes Yu <cyu@mozilla.com>
Desc: Bug 1179353 - Implement a stable screen automatic brightness algorithm. r=timdream

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "8c8f9093753f2101c9de9b51f04fead8d2e177c7", 
+        "git_revision": "e2fab8f6ac345ecde10a1350e699be9ceb6987d6", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "5662c54c7f6ef01d8e12fb4332333715fcec3752", 
+    "revision": "1ab9e5d9915dc22fed71384a53dc565bce1709aa", 
     "repo_path": "integration/gaia-central"
 }