Quick fix to get 7DA counts for unified Chrome / App Launcher.

chrome/installer/setup/uninstall.cc

 // 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.
 //
 // This file defines the methods useful for uninstalling Chrome.
 
 #include "chrome/installer/setup/uninstall.h"
 
 #include <windows.h>
 
@@ skipping 1213 matching lines @@
 
     ProcessDelegateExecuteWorkItems(installer_state, product);
 
     ProcessOnOsUpgradeWorkItems(installer_state, product);
 
     UninstallActiveSetupEntries(installer_state, product);
 
     // Notify the shell that associations have changed since Chrome was likely
     // unregistered.
     SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, NULL, NULL);
+
+    // TODO(huangs): Implement actual migration code and remove the hack below.
+    // If the deprecated stand-alone App Launcher is absent, uninstall the
+    // "shadow" App launcher created.
+    if (original_state.GetProductState(false,

[grt (UTC plus 2), 2013/05/07 20:52:02]

I think you want simply:
    if (installer_state.is_multi_install()) {
      ...
    }
so that this happens for all multi- Chrome browser uninstalls. This prevents
uninstallation of Chrome canary from erroneously deleting the app host's version
key.

[grt (UTC plus 2), 2013/05/07 20:57:30]

As discussed in person, this suggesting isn't quite right. I'd forgotten about
the case where the user has the old-style app launcher installed and only Chrome
is being uninstalled.

[huangs, 2013/05/08 01:22:02]

Changed how existing App Launcher is detected; updated comment.

[huangs, 2013/05/08 01:22:02]

Also added check for multi-install, to prevent useless "dr" flags being set for
Canary and non-multi-install Chrome.

+                                       BrowserDistribution::CHROME_APP_HOST)) {
+      BrowserDistribution* shadow_app_launcher_dist =
+          BrowserDistribution::GetSpecificDistribution(
+              BrowserDistribution::CHROME_APP_HOST);
+      InstallUtil::DeleteRegistryKey(reg_root,
+                                     shadow_app_launcher_dist->GetVersionKey());
+    }
   }
 
   if (product.is_chrome_frame()) {
     ProcessChromeFrameWorkItems(original_state, installer_state, setup_path,
                                 product);
   }
 
   if (installer_state.is_multi_install()) {
     ProcessGoogleUpdateItems(original_state, installer_state, product);
 
@@ skipping 165 matching lines @@
     // deletion unconditionally. If they are not empty, the session manager
     // will not delete them on reboot.
     ScheduleParentAndGrandparentForDeletion(target_path);
   } else if (DeleteApplicationProductAndVendorDirectories(target_path) ==
              installer::DELETE_FAILED) {
     *uninstall_status = installer::UNINSTALL_FAILED;
   }
 }
 
 }  // namespace installer