The amd64-generic-asan builder is failing due to insecure RUNPATHs in chrome-sandbox.
Builder link: https://ci.chromium.org/p/chromeos/builders/luci.chromeos.general/Prod/b8942770578790059920

From the logs:

chromeos-chrome-69.0.3464.0_rc-r1: scanelf: rpath_security_checks(): Security problem with DT_RPATH='$ORIGIN/.' in /build/amd64-generic/tmp/portage/chromeos-base/chromeos-chrome-69.0.3464.0_rc-r1/image/opt/google/chrome/chrome-sandbox with mode set of 4755
chromeos-chrome-69.0.3464.0_rc-r1: scanelf: rpath_security_checks(): Security problem with DT_RPATH='$ORIGIN/.' in /build/amd64-generic/tmp/portage/chromeos-base/chromeos-chrome-69.0.3464.0_rc-r1/image/opt/google/chrome/chrome-sandbox with mode set of 4755
chromeos-chrome-69.0.3464.0_rc-r1: 
chromeos-chrome-69.0.3464.0_rc-r1:  * QA Notice: The following files contain insecure RUNPATHs
chromeos-chrome-69.0.3464.0_rc-r1:  *  Please file a bug about this at http://bugs.gentoo.org/
chromeos-chrome-69.0.3464.0_rc-r1:  *  with the maintaining herd of the package.
chromeos-chrome-69.0.3464.0_rc-r1:  * $ORIGIN/. /build/amd64-generic/tmp/portage/chromeos-base/chromeos-chrome-69.0.3464.0_rc-r1/image/opt/google/chrome/chrome-sandbox
chromeos-chrome-69.0.3464.0_rc-r1: 
chromeos-chrome-69.0.3464.0_rc-r1:  * ERROR: chromeos-base/chromeos-chrome-69.0.3464.0_rc-r1::chromiumos failed:
chromeos-chrome-69.0.3464.0_rc-r1:  *   Aborting due to serious QA concerns with RUNPATH/RPATH