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

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https://hg.mozilla.org/integration/gaia-central/rev/b9426a33b003
Author: Ricky Chien <rickychien@users.noreply.github.com>
Desc: Merge pull request #33872 from mozilla-b2g/revert-33864-backspaceToBack

Revert "Bug 1238870 - Backspace key for back function"

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https://hg.mozilla.org/integration/gaia-central/rev/167b7f8f6372
Author: Ricky Chien <rickychien@users.noreply.github.com>
Desc: Revert "Bug 1238870 - Backspace key for back function"

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "113afdb919093dd517ce464a3f014c4baa87250f", 
+        "git_revision": "e59727554e22f0290400959c0a2d26a7cac68f11", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "9fcd5e680c44d51e7b0af8acf0ea4ae55e8b212f", 
+    "revision": "b9426a33b0039937f825024d1434aeedbe0ca123", 
     "repo_path": "integration/gaia-central"
 }