Force migrate all clients from multi-install back to single-install.

chrome/test/mini_installer/config/chrome_user_updated.prop

Index: chrome/test/mini_installer/config/chrome_user_updated.prop
diff --git a/chrome/test/mini_installer/config/chrome_user_updated.prop b/chrome/test/mini_installer/config/chrome_user_updated.prop
index d8b478fa6ed9e5e5c627dac7e17e8bd3ba3e4b9c..a0e74a11b505ef724f1eb10ad81fd4001458d775 100644
--- a/chrome/test/mini_installer/config/chrome_user_updated.prop
+++ b/chrome/test/mini_installer/config/chrome_user_updated.prop
@@ -23,12 +23,7 @@
       }
     },
     "HKEY_CURRENT_USER\\$BINARIES_UPDATE_REGISTRY_SUBKEY": {
-      "exists": "required",
-      "values": {
-        "pv": {"type": "SZ", "data": "$NEXT_VERSION_MINI_INSTALLER_FILE_VERSION"},
-        "opv": {},
-        "cmd": {}
-      }
+      "exists": "forbidden"
     },
     "HKEY_CURRENT_USER\\$LAUNCHER_UPDATE_REGISTRY_SUBKEY": {
       "condition": "'$CHROME_SHORT_NAME' == 'Chrome'",
@@ -39,7 +34,7 @@
       "values": {
         "UninstallString": {
           "type": "SZ",
-          "data": "\"$LOCAL_APPDATA\\$CHROME_DIR\\Application\\$NEXT_VERSION_MINI_INSTALLER_FILE_VERSION\\Installer\\setup.exe\" --uninstall --multi-install --chrome --verbose-logging"
+          "data": "\"$LOCAL_APPDATA\\$CHROME_DIR\\Application\\$NEXT_VERSION_MINI_INSTALLER_FILE_VERSION\\Installer\\setup.exe\" --uninstall --verbose-logging"
         },
         "Version": {"type": "SZ", "data": "$NEXT_VERSION_MINI_INSTALLER_FILE_VERSION"}
       }