Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/7dfdbafbf610
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #22967 from KevinGrandon/bug_1031225_cherry_pick_bug_1047645_to_v1dot4

Bug 1047645 - Use manual timeout to guard _closed event from not firing

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https://hg.mozilla.org/integration/gaia-1_4/rev/309c06bdc71a
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1047645 - Use manual timeout to guard _closed event from not firing r=alive

Patch for v1.4.

Conflicts:
	apps/system/js/app_transition_controller.js
	apps/system/js/app_window.js
	apps/system/test/unit/app_window_test.js
	apps/system/test/unit/lockscreen_window_test.js
Bumping manifests a=b2g-bump