Suppress lsan leak in test that wrongly tears down V8.

TBR=yangguo@chromium.org
BUG=323149

Review URL: https://codereview.chromium.org/87573004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237292 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237292