Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/034a3fec9376
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #12137 from arasbm/bug-909372-view-activity-save-robustness

bug-909372 [gallery] Improve view activity saving robustness r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/0e53d953bd46
Author: Aras Balali Moghaddam <arasbm@gmail.com>
Desc: bug-909372 [gallery] Improve view activity saving robustness r=johnhu

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https://hg.mozilla.org/integration/gaia-central/rev/ed160ae6e991
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #12153 from crdlc/bug-915578

Bug 915578 - Delete BookmarkEditor from Homescreen

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https://hg.mozilla.org/integration/gaia-central/rev/54f35432d48f
Author: crdlc <crdlc@tid.es>
Desc: Bug 915578 - Delete BookmarkEditor from Homescreen

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "373ab3009a8ab268dfea6c36482232e4ccdbc979", 
+    "revision": "034a3fec93763fe9c18c3ab40d5048bb3e587692", 
     "repo_path": "/integration/gaia-central"
 }