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

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https://hg.mozilla.org/integration/gaia-central/rev/1f7fa9656e7d
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc: Merge pull request #15023 from mpizza/Bug_956619

Bug 956619 - [keyboard] should use |hideKeyboardImmediately| instead of |frame.hidden = true| while |launchOnly| is true

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https://hg.mozilla.org/integration/gaia-central/rev/3bd5fb2b7a9c
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 956619 - [keyboard] should use |hideKeyboardImmediately| instead of |frame.hidden = true| while |launchOnly| is true

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "baeb7ca3935d4b306ca2d4bd6ab0257ce6727d97", 
+    "revision": "1f7fa9656e7d048acf7656e621adb0197fe208c5", 
     "repo_path": "/integration/gaia-central"
 }