Make a new yes/no messagebox wrapper function, use it in the bookmark alert....

chrome/browser/platform_util_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/platform_util.h"
 
 #include <commdlg.h>
 #include <dwmapi.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 140 matching lines @@
   // MSVC complains if we don't include != 0.
   return ::IsWindowVisible(view) != 0;
 }
 
 void SimpleErrorBox(gfx::NativeWindow parent,
                     const string16& title,
                     const string16& message) {
   win_util::MessageBox(parent, message, title, MB_OK | MB_SETFOREGROUND);
 }
 
+bool SimpleYesNoBox(gfx::NativeWindow parent,
+                    const string16& title,
+                    const string16& message) {
+  return win_util::MessageBox(parent, message.c_str(), title.c_str(),
+      MB_YESNO | MB_ICONWARNING | MB_SETFOREGROUND) == IDYES;
+}
+
 string16 GetVersionStringModifier() {
 #if defined(GOOGLE_CHROME_BUILD)
   FilePath module;
   string16 channel;
   if (PathService::Get(base::FILE_MODULE, &module)) {
     bool is_system_install =
         !InstallUtil::IsPerUserInstall(module.value().c_str());
 
     GoogleUpdateSettings::GetChromeChannel(is_system_install, &channel);
   }
   return channel;
 #else
   return string16();
 #endif
 }
 
 }  // namespace platform_util