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

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https://hg.mozilla.org/integration/gaia-central/rev/e79532810fdd
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #28988 from yzen/bug-1145279

Bug 1145279 - fixed a typo for accessibility-key-hint.

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https://hg.mozilla.org/integration/gaia-central/rev/8fbe067f9dca
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1145279 - fixed a typo for accessibility-key-hint.

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https://hg.mozilla.org/integration/gaia-central/rev/9eaa9cc51538
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #28940 from yzen/bug-1139963

Bug 1139963 - ensuring that action menu and activity window are exclusively visible to the screen reader.

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https://hg.mozilla.org/integration/gaia-central/rev/8e067398dfbf
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1139963 - ensuring that action menu and activity window are exclusively visible to the screen reader. r=alive

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "b63fc09ee549fbaa5064517f44ef77f0754a11e8", 
+        "git_revision": "d2f10e0fa18f3171c8b584e696241df7ddb07c82", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "7e15d7e2a38e4dcc6148c6fd0f5d34a5885feff6", 
+    "revision": "e79532810fdde7f92fe8363700ab2b7cdbc5772a", 
     "repo_path": "integration/gaia-central"
 }