Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/bdc67649eadb
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #17507 from timdream/mock-dom-request

Bug 974319 - MockDOMRequest and fix deviceStorage tests with setTimeout(), r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/22160b349a8c
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 974319 - Part IV - Include MockDOMRequest in bluetooth_transfer_test.js

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https://hg.mozilla.org/integration/gaia-central/rev/a4de28028846
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 974319 - Part III - Fix storage_watcher_test.js

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https://hg.mozilla.org/integration/gaia-central/rev/116211b70181
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: typo mock_navigator_get_device_storage

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https://hg.mozilla.org/integration/gaia-central/rev/c0688e812790
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 974319 - Part II - Fix MockDeviceStorage and Screenshot tests

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https://hg.mozilla.org/integration/gaia-central/rev/6af00035412e
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 974319 - MockDOMRequest and tests
Bumping manifests a=b2g-bump