Bug 1069063 - Implement Array.prototype.contains. r=till

--HG--
rename : js/src/tests/ecma_6/Array/browser.js => js/src/tests/ecma_7/Array/browser.js
rename : js/src/tests/ecma_6/Array/browser.js => js/src/tests/ecma_7/Array/shell.js
rename : js/src/tests/ecma_6/browser.js => js/src/tests/ecma_7/browser.js
rename : js/src/tests/ecma_6/shell.js => js/src/tests/ecma_7/shell.js
Bug 1062860 - Object.isSealed() should return true when given primitive values as input. r=till