Don't uninstall Google Update for Windows Installer-driven uninstalls.

chrome/installer/setup/setup_main.cc

Index: chrome/installer/setup/setup_main.cc
diff --git a/chrome/installer/setup/setup_main.cc b/chrome/installer/setup/setup_main.cc
index d76f6ce6c2dcd7f530ca88f1736375576eaaa727..2627ecc32c7e775ea08ea6f2d7ae1d2f29b018f0 100644
--- a/chrome/installer/setup/setup_main.cc
+++ b/chrome/installer/setup/setup_main.cc
@@ -628,10 +628,13 @@ installer::InstallStatus UninstallProducts(
   if (!system_level_cmd.GetProgram().empty())
     base::LaunchProcess(system_level_cmd, base::LaunchOptions());
 
-  // Tell Google Update that an uninstall has taken place.
-  // Ignore the return value: success or failure of Google Update
-  // has no bearing on the success or failure of Chrome's uninstallation.
-  google_update::UninstallGoogleUpdate(installer_state.system_install());
+  // Tell Google Update that an uninstall has taken place if this install did
+  // not originate from the MSI. Google Update has its own logic relating to
+  // MSI-driven uninstalls that conflicts with this. Ignore the return value:
+  // success or failure of Google Update has no bearing on the success or
+  // failure of Chrome's uninstallation.
+  if (!installer_state.is_msi())
+    google_update::UninstallGoogleUpdate(installer_state.system_install());
 
   return install_status;
 }