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

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https://hg.mozilla.org/integration/gaia-central/rev/ebe44dcbbaa8
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #32433 from Cwiiis/bug1214484-new-homescreen-intermittent-pinning-the-web

Bug 1214484 - Fix intermittent pinning_the_web_test. r=gmarty

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https://hg.mozilla.org/integration/gaia-central/rev/2e6b9e91de39
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1214484 - Fix intermittent pinning_the_web_test. r=gmarty

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https://hg.mozilla.org/integration/gaia-central/rev/cfa854f4831e
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #32412 from Cwiiis/bug1168969-new-homescreen-unpin-page

Bug 1168969 - Allow unpinning of pages. r=gmarty

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https://hg.mozilla.org/integration/gaia-central/rev/29264b0f30af
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1168969 - Allow unpinning of pages. r=gmarty

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "ab08c32e8bd96c1fa1c8041f711ba9b14174750b", 
+        "git_revision": "6905956c041a42107aaa8b503baaf83c9a599591", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "074d040ef6c8e19f234a362cc616518827eaaa3b", 
+    "revision": "ebe44dcbbaa8fdbc3943b359a670a0b9d01a8896", 
     "repo_path": "integration/gaia-central"
 }