Delete Promises Layout Tests.

LayoutTests/fast/js/Promise-init-expected.txt

-Test Promise.
-
-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
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-PASS promise instanceof Promise is true
-PASS promise.constructor is Promise
-PASS thisInInit === promise is false
-PASS thisInInit === window is true
-PASS resolve instanceof Function is true
-PASS reject instanceof Function is true
-PASS new Promise() threw exception TypeError: Promise constructor takes a function argument.
-PASS new Promise(37) threw exception TypeError: Promise constructor takes a function argument.
-PASS promise = new Promise(function() { throw Error("foo"); }) did not throw exception.
-PASS result.message is "foo"
-PASS fulfilled
-PASS result is "hello"
-PASS successfullyParsed is true
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-TEST COMPLETE
-