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

chrome/installer/setup/installer_state.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_INSTALLER_SETUP_INSTALLER_STATE_H_
 #define CHROME_INSTALLER_SETUP_INSTALLER_STATE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 130 matching lines @@
   HKEY root_key() const { return root_key_; }
 #endif
 
   // The ClientState key by which we interact with Google Update.
   const base::string16& state_key() const { return state_key_; }
 
   // Convenience method to return the type of the BrowserDistribution associated
   // with the ClientState key we will be interacting with.
   BrowserDistribution::Type state_type() const { return state_type_; }
 
+  // Returns true if this is an update of multi-install Chrome to
+  // single-install.
+  bool is_migrating_to_single() const { return is_migrating_to_single_; }
+
   // Returns the BrowserDistribution instance corresponding to the binaries for
   // this run if we're operating on a multi-package product.
   BrowserDistribution* multi_package_binaries_distribution() const {
     DCHECK(package_type_ == MULTI_PACKAGE);
     DCHECK(multi_package_distribution_ != NULL);
     return multi_package_distribution_;
   }
 
   const Products& products() const { return products_.get(); }
 
@@ skipping 102 matching lines @@
   base::Version critical_update_version_;
   ProgressCalculator progress_calculator_;
   Level level_;
   PackageType package_type_;
 #if defined(OS_WIN)
   HKEY root_key_;
 #endif
   bool msi_;
   bool background_mode_;
   bool verbose_logging_;
+  bool is_migrating_to_single_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InstallerState);
 };  // class InstallerState
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_INSTALLER_STATE_H_