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

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https://hg.mozilla.org/integration/gaia-central/rev/b19c7256a967
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #31717 from scottwu/1179343-hotspot-enable-disable-msg

Bug 1179343 - Wi-Fi hotspot layout to show enabled/disabled messages, r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/b50656788a20
Author: Scott Wu <scottcwwu@gmail.com>
Desc: Bug 1179343 - Wi-Fi hotspot layout to show enabled/disabled messages. r=gasolin

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "ef5a291e44fea82f0e3793ac4f17eaa2188af7e0", 
+        "git_revision": "7e9315183b91fe549a75750d784b1fecafe426c2", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "daee6dfb8bf71d5e0fe61b52e8ccf66f19bbcbd8", 
+    "revision": "b19c7256a967df90c8f79ad78917f13da360d4a7", 
     "repo_path": "integration/gaia-central"
 }