Remove support code that was used to pin asan to an older revision.

It's no longer needed.

BUG=170629

Review URL: https://codereview.chromium.org/14568002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@197404 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed