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

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https://hg.mozilla.org/integration/gaia-central/rev/f57ba3848b8d
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #17897 from arcturus/bug-990496

Bug 990496 - [Contacts] Error when user tries to cancel importing contacts

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https://hg.mozilla.org/integration/gaia-central/rev/49f264631fcf
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 990496 - [Contacts] Error when user tries to cancel importing contacts

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https://hg.mozilla.org/integration/gaia-central/rev/e9efe93a8c36
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #17877 from verchaswa/Bug989023_Camera_MADAI_Mozilla_image_Preview_button_needs_highlight_state

[Bug 989023][Camera][Madai][Mozilla]Image Preview button needs highlight...

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https://hg.mozilla.org/integration/gaia-central/rev/fc14d2e8deb5
Author: verchaswa.sharma <verchaswa.sharma@lge.com>
Desc: [Bug 989023][Camera][Madai][Mozilla]Image Preview button needs highlight state

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "b8eae9817bd2edc1b10c931c413fa453644388bb", 
+    "revision": "f57ba3848b8d880bef4962ab09d3699a65f7d7a1", 
     "repo_path": "/integration/gaia-central"
 }