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

chrome/test/mini_installer/config/chrome_multi_system_installed.prop

Index: chrome/test/mini_installer/config/chrome_multi_system_installed.prop
diff --git a/chrome/test/mini_installer/config/chrome_multi_system_installed.prop b/chrome/test/mini_installer/config/chrome_multi_system_installed.prop
new file mode 100644
index 0000000000000000000000000000000000000000..9a8dd5df39b1040c4b2ae5f96e0ccd72043f9735
--- /dev/null
+++ b/chrome/test/mini_installer/config/chrome_multi_system_installed.prop
@@ -0,0 +1,49 @@
+{
+  "Files": {
+    "$PROGRAM_FILES\\$CHROME_DIR\\Application\\chrome.exe": {"exists": true},
+    "$PROGRAM_FILES\\$CHROME_DIR\\Application\\chrome.VisualElementsManifest.xml": {"exists": true},
+    "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\chrome.dll":
+        {"exists": true},
+    "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\chrome_elf.dll":
+        {"exists": true},
+    "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\Installer\\chrome.7z":
+        {"exists": true},
+    "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\Installer\\setup.exe":
+        {"exists": true},
+    "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\$MINI_INSTALLER_FILE_VERSION.manifest":
+        {"exists": true},
+    "$PROGRAM_FILES\\$CHROME_DIR\\Application\\$NEXT_VERSION_MINI_INSTALLER_FILE_VERSION":
+        {"exists": false}
+  },
+  "RegistryEntries": {
+    "HKEY_LOCAL_MACHINE\\$CHROME_UPDATE_REGISTRY_SUBKEY": {
+      "exists": "required",
+      "values": {
+        "pv": {"type": "SZ", "data": "$MINI_INSTALLER_FILE_VERSION"}
+      }
+    },
+    "HKEY_LOCAL_MACHINE\\$BINARIES_UPDATE_REGISTRY_SUBKEY": {
+      "exists": "required",
+      "values": {
+        "pv": {"type": "SZ", "data": "$MINI_INSTALLER_FILE_VERSION"}
+      }
+    },
+    "HKEY_LOCAL_MACHINE\\$LAUNCHER_UPDATE_REGISTRY_SUBKEY": {
+      "condition": "'$CHROME_SHORT_NAME' == 'Chrome'",
+      "exists": "forbidden"
+    },
+    "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\$CHROME_LONG_NAME": {
+      "exists": "required",
+      "values": {
+        "UninstallString": {
+          "type": "SZ",
+          "data": "\"$PROGRAM_FILES\\$CHROME_DIR\\Application\\$MINI_INSTALLER_FILE_VERSION\\Installer\\setup.exe\" --uninstall --multi-install --chrome --system-level --verbose-logging"
+        },
+        "Version": {"type": "SZ", "data": "$MINI_INSTALLER_FILE_VERSION"}
+      }
+    },
+    "HKEY_LOCAL_MACHINE\\Software\\Classes\\$CHROME_SHORT_NAME": {
+      "exists": "forbidden"
+    }
+  }
+}