Support rollback with installerdata in mini_installer

chrome/installer/util/util_constants.h

Index: chrome/installer/util/util_constants.h
diff --git a/chrome/installer/util/util_constants.h b/chrome/installer/util/util_constants.h
index 13c905d8b84a7c30785221f34836bfeb920bc8dc..e5c5914b41c6a43d94946b3571905e7b3259891c 100644
--- a/chrome/installer/util/util_constants.h
+++ b/chrome/installer/util/util_constants.h
@@ -88,8 +88,11 @@ enum InstallStatus {
   REENABLE_UPDATES_FAILED = 56,  // Autoupdates could not be enabled.
   UNPACKING_FAILED     = 57,  // Unpacking the (possibly patched) uncompressed
                               // archive failed.
+  IN_USE_ROLLBACK      = 58,  // Chrome successfully rollback but current

[Georges Khalil, 2016/04/27 12:38:02]

nit (comment suggestion): Successful chrome rollback but current version is
still running.

[zmin, 2016/04/27 15:20:18]

Done.

+                              // version is running.
+  OLD_VERSION_ROLLBACK = 59,  // Chrome successfully rollback to old version.

[Georges Khalil, 2016/04/27 12:38:02]

nit (comment suggestion): Successful chrome rollback to an older version.

[zmin, 2016/04/27 15:20:18]

Done.

 
-  MAX_INSTALL_STATUS = 58,    // Bump this out to make space for new results.
+  MAX_INSTALL_STATUS   = 60,  // Bump this out to make space for new results.
 };
 
 // The type of an update archive.