Per:
 - https://github.com/tc39/test262/issues/866#issuecomment-328565337
 - https://github.com/tc39/test262/issues/866#issuecomment-359978873

Closes #866.

A number of tests for the parsing of object initializers were expressed
using `eval`. This made the tests more complex than necessary and also
prevented the tests from providing value to ECMAScript parsers.

Remove the use of `eval` in the relevant tests and instead express the
expectations with literal source text.

A number of tests for the parsing of the DeleteExpression production
were expressed using `eval`. This made the tests more complex than
necessary, and also prevented the tests from providing value to
ECMAScript parsers.

Remove the use of `eval` in the relevant tests and instead express the
expectations with literal source text. Remove superfluous tests which
only differed in the runtime semantics of source text that could not be
evaluated due to syntax errors.