Bumping gaia.json for 1 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/65e52204f9f5
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 948596 - fullscreen state of activity window

Conflicts:
	apps/system/js/activity_window.js
	apps/system/test/unit/activity_window_test.js