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

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https://hg.mozilla.org/integration/gaia-central/rev/6e9fb86b1e57
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #29353 from gaye/mozilla-download-v1.0.0

mozilla-download@1.0.3

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https://hg.mozilla.org/integration/gaia-central/rev/8a1152ad3a89
Author: gaye <gaye@mozilla.com>
Desc: mozilla-download@1.0.3

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https://hg.mozilla.org/integration/gaia-central/rev/ff7cafdfe5b1
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1151050 - merge pull request #29334 from davidflanagan:bug1151050 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/49288100772c
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 1151050 - remove a really old workaround in gesture_detector.js

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "834385f4c834238a4306bf87cc4be41615d91ff0", 
+        "git_revision": "d8f92f7bf0ea07fc40cdef038d36237a4ebe8c3b", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "e7a7a8c4f624820b810b33e098a3e7d941de53a1", 
+    "revision": "6e9fb86b1e57824e9cbd911b7eb800d21fe51e6c", 
     "repo_path": "integration/gaia-central"
 }