Reduce flakes in the mini_installer test.

chrome/test/mini_installer/config/config.config

 {
   "states": [
+    ["no_pv", ["chrome_user_no_pv.prop",
+               "chrome_system_no_pv.prop"]],
     ["clean", ["chrome_user_not_installed.prop",
                "chrome_system_not_installed.prop",
                "chrome_user_not_inuse.prop",
                "chrome_system_not_inuse.prop"]],
     ["chrome_user_installed_not_inuse", ["chrome_user_installed.prop",
                                          "chrome_system_not_installed.prop",
                                          "chrome_user_not_inuse.prop",
                                          "chrome_system_not_inuse.prop"]],
     ["chrome_system_installed_not_inuse", ["chrome_user_not_installed.prop",
                                            "chrome_system_installed.prop",
@@ skipping 23 matching lines @@
      "python quit_chrome.py \"$PROGRAM_FILES\\$CHROME_DIR\\Application\\chrome.exe\""],
     ["uninstall_chrome_user",
      "python uninstall_chrome.py --chrome-long-name=\"$CHROME_LONG_NAME\""],
     ["uninstall_chrome_system",
      "python uninstall_chrome.py --chrome-long-name=\"$CHROME_LONG_NAME\" --system-level"]
   ],
   "tests": [
     {
       "name": "ChromeUserLevel",
       "traversal": [
-        "clean",
+        "no_pv",
         "install_chrome_user", "chrome_user_installed_not_inuse",
         "launch_chrome_user", "chrome_user_installed_inuse",
         "quit_chrome_user", "chrome_user_installed_not_inuse",
         "uninstall_chrome_user", "clean"
       ]
     },
     {
       "name": "ChromeSystemLevel",
       "traversal": [
-        "clean",
+        "no_pv",
         "install_chrome_system", "chrome_system_installed_not_inuse",
         "launch_chrome_system", "chrome_system_installed_inuse",
         "quit_chrome_system", "chrome_system_installed_not_inuse",
         "uninstall_chrome_system", "clean"
       ]
     }
   ]
 }