Check destination in sandbox CopyParamIn

This doesn't appear accessible in our code, but it's an easy check.

BUG=82817
R=cpu
NOTRY=true

Review URL: https://codereview.chromium.org/180703005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254334 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254334