Fix broken installer tests.

chrome/test/mini_installer/variable_expander.py

Index: chrome/test/mini_installer/variable_expander.py
diff --git a/chrome/test/mini_installer/variable_expander.py b/chrome/test/mini_installer/variable_expander.py
index 71dcf8f99b6c9034dd81ee8bf277106fa72bebcd..f313a9c18a86dfe10833faf5065e617b7ec228ab 100644
--- a/chrome/test/mini_installer/variable_expander.py
+++ b/chrome/test/mini_installer/variable_expander.py
@@ -72,8 +72,6 @@ class VariableExpander:
             key, of Chrome for Google Update.
         * $CHROME_UPDATE_REGISTRY_SUBKEY_SXS: the registry key, excluding the
             root key, of Chrome SxS for Google Update.
-        * $LAUNCHER_UPDATE_REGISTRY_SUBKEY: the registry key, excluding the root
-            key, of the app launcher for Google Update if $SUPPORTS_SXS.
         * $LOCAL_APPDATA: the unquoted path to the Local Application Data
             folder.
         * $MINI_INSTALLER: the unquoted path to the mini_installer.
@@ -133,9 +131,6 @@ class VariableExpander:
           'CHROME_UPDATE_REGISTRY_SUBKEY_SXS': (
             'Software\\Google\\Update\\Clients\\'
             '{4ea16ac7-fd5a-47c3-875b-dbf4a2008c20}'),
-          'LAUNCHER_UPDATE_REGISTRY_SUBKEY': (
-            'Software\\Google\\Update\\Clients\\'
-            '{FDA71E6F-AC4C-4a00-8B70-9958A68906BF}')
       })
     elif mini_installer_product_name == 'Chromium Installer':
       self._variable_mapping.update({