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

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https://hg.mozilla.org/integration/gaia-central/rev/65bc12c42fbd
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #14637 from gasolin/issue-916660

Bug 916660 - [Window Management] refactor app modal dialog, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/c2b7a5c399d6
Author: gasolin <gasolin@gmail.com>
Desc: Bug 916660 - [Window Management] refactor app modal dialog

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https://hg.mozilla.org/integration/gaia-central/rev/4edda9e2838b
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #14608 from rexboy7/fix-bug922006

bug 922006 - [Dialer] Refactor onload event listener to make dialer.js testable. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/dc7849bf11ea
Author: Rex Lee <rexboy@mozilla.com>
Desc: bug 922006 - [Dialer] Refactor onload event listener to make dialer.js testable