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

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https://hg.mozilla.org/integration/gaia-central/rev/a668b5500d1b
Author: Fernando Jiménez Moreno <ferjmoreno@gmail.com>
Desc: Merge pull request #31798 from michielbdejong/1202449-fxa-promises

Bug 1202449 - FxA promises. r=ferjm

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https://hg.mozilla.org/integration/gaia-central/rev/d1e04afadd46
Author: Michiel de Jong <mbdejong@mozilla.com>
Desc: Bug 1202449 - FxA promises, r=ferjm

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https://hg.mozilla.org/integration/gaia-central/rev/b22b98680e0e
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #30898 from azasypkin/bug-1176976-remove-draft-dialogs

Bug 1176976 - [Messages][Drafts] Remove the draft saving/replacing action menu. r=julien

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https://hg.mozilla.org/integration/gaia-central/rev/20b16198c6b5
Author: Aleh Zasypkin <azasypkin@mozilla.com>
Desc: Bug 1176976 - [Messages][Drafts] Remove the draft saving/replacing action menu. r=julien

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "738d74f9a0357749303d4987ccfa550d3aa9d151", 
+        "git_revision": "c7dbd85db1b9d143d3fbbeaaf0c7b7062c6c1fa4", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "4603c14d56771bfa1c57cd481b42f8de014519da", 
+    "revision": "a668b5500d1ba9163aee45c36d947b188aec93c1", 
     "repo_path": "integration/gaia-central"
 }