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

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https://hg.mozilla.org/integration/gaia-central/rev/e84536460d28
Author: Ben Francis <ben@tola.me.uk>
Desc: Merge pull request #20074 from benfrancis/1020403

Bug 1020403 - Change button type to button to prevent click event on submit r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/4d7aa0a2b08f
Author: Ben Francis <ben@tola.me.uk>
Desc: Bug 1020403 - Change button type to button to prevent click event on submit

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https://hg.mozilla.org/integration/gaia-central/rev/e292f82e1e24
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #20066 from lanker-sony/splash-icon-uri

Bug 1020903 - Missing splash icon when an application is hosted via https

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https://hg.mozilla.org/integration/gaia-central/rev/d7339e13fdc0
Author: Fredrik Lanker <fredrik.lanker@sonymobile.com>
Desc: Bug 1020903 - Missing splash icon when an application is hosted via https

With the way the URI was constructed before, if https was used with
default port, a.port would be empty and port 80 would wrongly be used.
Instead, we now use the origin as it is.
Bumping manifests a=b2g-bump