Remove bouncycastle dependency from 021-string2.

The part of the test 021-string2 using bouncycastle was
added with the String representation change,
    https://android-review.googlesource.com/79174 ,
but the only thing it seems to be testing (with respect to
that CL) is the String(char[]) constructor. Therefore,
change the test to call that constructor directly.

Test: testrunner.py --host -t 021-string2
Change-Id: Ifbac88609ffc190d577d48880a451d2279c2a078
1 file changed