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

chrome/installer/mini_installer/mini_installer_constants.cc

Index: chrome/installer/mini_installer/mini_installer_constants.cc
diff --git a/chrome/installer/mini_installer/mini_installer_constants.cc b/chrome/installer/mini_installer/mini_installer_constants.cc
index e21e433a8ca7d810e8e4908f47dcd7d6100b4fee..751d25b7495340ebf74282a45a21578b06f20142 100644
--- a/chrome/installer/mini_installer/mini_installer_constants.cc
+++ b/chrome/installer/mini_installer/mini_installer_constants.cc
@@ -50,12 +50,16 @@ const wchar_t kCleanupRegistryValue[] = L"ChromeInstallerCleanup";
 const wchar_t kInstallerErrorRegistryValue[] = L"InstallerError";
 const wchar_t kInstallerExtraCode1RegistryValue[] = L"InstallerExtraCode1";
 const wchar_t kInstallerResultRegistryValue[] = L"InstallerResult";
+const wchar_t kPvRegistryValue[] = L"pv";
+const wchar_t kUninstallArgumentsRegistryValue[] = L"UninstallArguments";
 // The name of an app's Client State registry value that holds the path to its
 // uninstaller.
 const wchar_t kUninstallRegistryValue[] = L"UninstallString";
 
 // Registry key paths.
 #if defined(GOOGLE_CHROME_BUILD)
+// The path to the key containing each app's Clients registry key.
+const wchar_t kClientsKeyBase[] = L"Software\\Google\\Update\\Clients\\";
 // The path to the key containing each app's Client State registry key.
 const wchar_t kClientStateKeyBase[] =
     L"Software\\Google\\Update\\ClientState\\";
@@ -63,6 +67,9 @@ const wchar_t kClientStateKeyBase[] =
 const wchar_t kCleanupRegistryKey[] =
     L"Software\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\Google Chrome";
 #else
+// The path to the key containing each app's Clients registry key.
+// No trailing slash on this one because the app's GUID is not appended.
+const wchar_t kClientsKeyBase[] = L"Software\\Chromium";
 // The path to the key containing each app's Client State registry key.
 // No trailing slash on this one because the app's GUID is not appended.
 const wchar_t kClientStateKeyBase[] = L"Software\\Chromium";