Bug 854868 - Make srcdir and objdir paths match for in accessible/tests [r=tbsaunde]

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extra : rebase_source : 48ed2b3f811f4225c07276c931d26c00ccd25e6a
Bug 858674 - 'Tweak SQLite pragmas on mobile devices for space savings'. r=khuey.
Bug 855704 - Use pushPrefEnv instead of setBoolPref in webspeech tests. r=smaug

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extra : rebase_source : 06034c89046557ad40834bad29fae9d76b5b0485