Add ASAN to .gitignore.

BUG=
TEST=If ASAN has been added to the .gclient entries & fetched, git status should not list third_party/asan.


Review URL: http://codereview.chromium.org/7686020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97908 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed