Remove test_expectations_asan.txt (it moved to Blink).

R=eseidel@chromium.org, ojan@chromium.org
BUG=337598

Review URL: https://codereview.chromium.org/143003017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247392 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247392