Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7c3f7a11b9b2
Author: No-Jun Park <npark@mozilla.com>
Desc: Merge pull request #31500 from npark-mozilla/1197468

Bug 1197468 - Imagecompare: remove unnecessary self.email.wait_for_search_textbox_hidden() call

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https://hg.mozilla.org/integration/gaia-central/rev/a31fd29ad849
Author: No-Jun Park <npark@mozilla.com>
Desc: Bug 1197468 - Imagecompare: remove unnecessary self.email.wait_for_search_textbox_hidden() call

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https://hg.mozilla.org/integration/gaia-central/rev/76f56387bc47
Author: Zibi Braniecki <gandalf@mozilla.com>
Desc: Follow up to the FTU cleanup patch. r=sfoster

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "f5c06b26312d9c664c3ef7f6e8b9f5ca7fbf5b3a", 
+        "git_revision": "97cb6736d0f2f637ebd7dd21683ff7fa670c2507", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "8d41f093fedd3388599483963c715646896c2b63", 
+    "revision": "7c3f7a11b9b257b2f54d8558be00377b8f1637b9", 
     "repo_path": "integration/gaia-central"
 }