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

========

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

========

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

========

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...

========

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
Bumping manifests a=b2g-bump