Attempt to reland http://codereview.chromium.org/4928002/...

chrome/browser/browser_main_win.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/browser_main.h"
 #include "chrome/browser/browser_main_win.h"
 
 #include <windows.h>
 #include <shellapi.h>
 
@@ skipping 170 matching lines @@
     std::transform(exe.begin(), exe.end(), exe.begin(), tolower);
     std::wstring user_exe_path = installer::GetChromeInstallPath(false);
     std::transform(user_exe_path.begin(), user_exe_path.end(),
                    user_exe_path.begin(), tolower);
     if (exe == user_exe_path) {
       const std::wstring text =
           l10n_util::GetString(IDS_MACHINE_LEVEL_INSTALL_CONFLICT);
       const std::wstring caption = l10n_util::GetString(IDS_PRODUCT_NAME);
       const UINT flags = MB_OK | MB_ICONERROR | MB_TOPMOST;
       win_util::MessageBox(NULL, text, caption, flags);
-      std::wstring uninstall_cmd = InstallUtil::GetChromeUninstallCmd(false);
-      if (!uninstall_cmd.empty()) {
-        uninstall_cmd.append(L" --");
-        uninstall_cmd.append(installer_util::switches::kForceUninstall);
-        uninstall_cmd.append(L" --");
-        uninstall_cmd.append(installer_util::switches::kDoNotRemoveSharedItems);
+      FilePath uninstall_path(InstallUtil::GetChromeUninstallCmd(false));
+      CommandLine uninstall_cmd(uninstall_path);
+      if (!uninstall_cmd.GetProgram().value().empty()) {
+        uninstall_cmd.AppendSwitch(installer_util::switches::kForceUninstall);
+        uninstall_cmd.AppendSwitch(
+            installer_util::switches::kDoNotRemoveSharedItems);
         base::LaunchApp(uninstall_cmd, false, false, NULL);
       }
       return true;
     }
   }
   return false;
 }
 
 // BrowserMainPartsWin ---------------------------------------------------------
 
@@ skipping 25 matching lines @@
       base::EnsureNSPRInit();
     }
   }
 };
 
 // static
 BrowserMainParts* BrowserMainParts::CreateBrowserMainParts(
     const MainFunctionParams& parameters) {
   return new BrowserMainPartsWin(parameters);
 }