Bumping gaia.json for 7 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/2f28ffcec8ee
Author: Gareth Aye <gaye@mozilla.com>
Desc: Add @fileoverview to gaia_marionette_retry.js a=test-only

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https://hg.mozilla.org/integration/gaia-central/rev/9ac72144c277
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #27891 from tedders1/bug-1105035-fix-attempt-2

Bug-1105035: Allow use of utility tray with full-screen element. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/8ca24c5ceadb
Author: Ted Clancy <tclancy@mozilla.com>
Desc: Bug-1105035: Allow use of utility tray with full-screen element. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/3dbea737d3c1
Author: Miller Medeiros <miller@millermedeiros.com>
Desc: Merge pull request #27930 from gaye/bug-1128483

Bug 1128483 - Fix month view test that checks for greyed-out days outside current month r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/92ae50e75374
Author: gaye <gaye@mozilla.com>
Desc: Bug 1128483 - Fix month view test that checks for greyed-out days outside current month

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https://hg.mozilla.org/integration/gaia-central/rev/3d795ef87022
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #27472 from ythej/bug_961572

Bug 961572 - [Messages][Refactoring] Implement a new independent cancel button for information view's header

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https://hg.mozilla.org/integration/gaia-central/rev/7d057696f19b
Author: Vishnu Teja <vish.thej@gmail.com>
Desc: Bug 961572 - [Messages][Refactoring] Implement a new independent cancel button for information view's header r= Steve Chung

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "18eafe175357377d975815e75b707f64d8ecf8a5", 
+        "git_revision": "a2d74410856d3a8237797480a52dde8e8c80e11e", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "e7de4071517371a8b18801c1d2062f1b11123572", 
+    "revision": "2f28ffcec8ee0498559fbc2e3033148a38c2113a", 
     "repo_path": "integration/gaia-central"
 }