Move ChangeVersionWrapper destructor out of line.

With clang/win, the vtable of ChangeVersionWrapper ends up being referenced
for some reason, which causes the destructor to be defined, which requires
a definition of SQLErrorData. So move the destructor out of line, where
the definition is available.

BUG=413478
R=michaeln@chromium.org, rnk@chromium.org

Review URL: https://codereview.chromium.org/572343002

git-svn-id: svn://svn.chromium.org/blink/trunk@182093 bbb929c8-8fbe-4397-9dbb-9b2b20218538