Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/071ea0cd996c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #30143 from huchengtw-moz/bug-1164353-v2

Bug 1164353 - migrate browser context menu to use smart-modal-dialog

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https://hg.mozilla.org/integration/gaia-central/rev/a0b0d4e839d1
Author: John Hu <johu@mozilla.com>
Desc: Bug 1164353 - migrate browser context menu to use smart-modal-dialog

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "fa36669c169d2b401cecd2eda3b6a69e918ce702", 
+        "git_revision": "f968fd179b51624c19021cb816b2e16d660abcdb", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "b282a942aba95fc70db510a69a6900aa8034fe2a", 
+    "revision": "071ea0cd996c9a310c5e7527d8cce06c185f547c", 
     "repo_path": "integration/gaia-central"
 }