Remove DefaultHostnameVerifier from preloaded-classes.

libcore's DefaultHostnameVerifier no longer exists. See
https://android-review.googlesource.com/#/c/117453/.

Bug: 18481199
Change-Id: I5c07e058aaaf8531d420058cfd104c4e751757a3
Merge "Remove DefaultHostnameVerifier from preloaded-classes."