Add mini_installer not-in-use update test.

chrome/test/mini_installer/config/chrome_user_installed.prop

 {
   "Files": {
     "$LOCAL_APPDATA\\$CHROME_DIR\\Application\\chrome.exe": {"exists": true},
     "$LOCAL_APPDATA\\$CHROME_DIR\\Application\\chrome.VisualElementsManifest.xml": {"exists": true},
     "$LOCAL_APPDATA\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\chrome.dll":
         {"exists": true},
     "$LOCAL_APPDATA\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\chrome_elf.dll":
         {"exists": true},
     "$LOCAL_APPDATA\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\Installer\\chrome.7z":
         {"exists": true},
     "$LOCAL_APPDATA\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\Installer\\setup.exe":
         {"exists": true},
     "$LOCAL_APPDATA\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\$MINI_INSTALLER_FILE_VERSION.manifest":
-        {"exists": true}
+        {"exists": true},
+    "$LOCAL_APPDATA\\$CHROME_DIR\\Application\\$NEXT_VERSION_MINI_INSTALLER_FILE_VERSION":
+        {"exists": false}
   },
   "RegistryEntries": {
     "HKEY_CURRENT_USER\\$CHROME_UPDATE_REGISTRY_SUBKEY": {
       "exists": "required",
       "values": {
         "pv": {"type": "SZ", "data": "$MINI_INSTALLER_FILE_VERSION"}
       }
     },
     "HKEY_CURRENT_USER\\$BINARIES_UPDATE_REGISTRY_SUBKEY": {
       "exists": "required",
@@ skipping 16 matching lines @@
           "data": "\"$LOCAL_APPDATA\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\Installer\\setup.exe\" --uninstall --multi-install --chrome --verbose-logging"
         },
         "Version": {"type": "SZ", "data": "$MINI_INSTALLER_FILE_VERSION"}
       }
     },
     "HKEY_CURRENT_USER\\Software\\Classes\\$CHROME_SHORT_NAME$USER_SPECIFIC_REGISTRY_SUFFIX": {
       "exists": "forbidden"
     }
   }
 }