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

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https://hg.mozilla.org/integration/gaia-central/rev/7beabef71045
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #24268 from sudheesh001/Patch_1061516

Fixes Bug 1061516 , jshint error in tests/atoms/accessiblity.js r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/52dd0dc84242
Author: sudheesh001 <sudheesh1995@outlook.com>
Desc: Fixes Bug 1061516 , jshint error in tests/atoms/accessiblity.js

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https://hg.mozilla.org/integration/gaia-central/rev/579cee46a2e4
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #24267 from sudheesh001/Patch_1057770

Fixes Bug 1057770 - fixes jshint in tests/integration/devtools/server_test r=yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/e7e8c96cf3d3
Author: sudheesh001 <sudheesh1995@outlook.com>
Desc: Fixes Bug 1057770 - fixes jshint in tests/integration/devtools/server_test.js
Bumping manifests a=b2g-bump