The mini_installer_tests target builds/runs chrome/test/mini_installer/test_installer.py elevated/at high integrity by necessity since the test suite must install/uninstall system-level Chrome. When it launches Chrome, however, it should do so non-elevated/at medium integrity so that Chrome is running as-if it were being used by a normal interactive user. This would have avoided issue 916461, which only strikes when Chrome is run elevated.