Remove multi-install from install_static.

chrome/install_static/install_constants.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Defines the struct used to describe each of a brand's install modes; see
 // install_modes.h for details. For brands that integrate with Google Update,
 // each mode also describes a strategy for determining its update channel.
 
 #ifndef CHROME_INSTALL_STATIC_INSTALL_CONSTANTS_H_
 #define CHROME_INSTALL_STATIC_INSTALL_CONSTANTS_H_
@@ skipping 40 matching lines @@
   // The default name for this mode's update channel.
   const wchar_t* default_channel_name;
 
   // The strategy used to determine the mode's update channel, or UNSUPPORTED if
   // the brand does not integrate with Google Update.
   ChannelStrategy channel_strategy;
 
   // True if this mode supports system-level installs.
   bool supports_system_level;
 
-  // True if this mode supports multi-install.
-  bool supports_multi_install;
+  // True if this mode supported the now-deprecated multi-install.
+  bool supported_multi_install;
 };
 
 }  // namespace install_static
 
 #endif  // CHROME_INSTALL_STATIC_INSTALL_CONSTANTS_H_