Bug 1052931 - Add URLSearchParams to GlobalProperties for import. r=bholley

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extra : rebase_source : 2ec9189dc6a1092067690b4609ef6c3701171e67
Bug 1052734 - Use FileUtils.PERMS_FILE instead of magic octal constants in nsSearchService.js. r=MattN

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extra : rebase_source : 5e1870bdd08625ca395ad92a064ac212533930c2