Remove ReusableTileStore. Bug 837860

--HG--
rename : security/build/test-b2g-app-root-cert.der => security/build/b2g-app-root-cert.der
rename : security/manager/ssl/tests/unit/test_signed_apps/test-privileged-app-test-1.0.zip => security/manager/ssl/tests/unit/test_signed_apps/privileged-app-test-1.0.zip
extra : rebase_source : 1a6b9a02e2016e1c6251a286a127d9c3da4441ee