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

chrome/browser/platform_util.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_BROWSER_PLATFORM_UTIL_H_
 #define CHROME_BROWSER_PLATFORM_UTIL_H_
 
 #include "base/string16.h"
 #include "gfx/native_widget_types.h"
 
@@ skipping 21 matching lines @@
 // Activate the window, bringing it to the foreground top level.
 void ActivateWindow(gfx::NativeWindow window);
 
 // Returns true if the view is visible. The exact definition of this is
 // platform-specific, but it is generally not "visible to the user", rather
 // whether the view has the visible attribute set.
 bool IsVisible(gfx::NativeView view);
 
 // Pops up an error box with an OK button. If |parent| is non-null, the box
 // will be modal on it. (On Mac, it is always app-modal.) Generally speaking,
-// this class should not be used for much. Infobars are preferred.
+// this function should not be used for much. Infobars are preferred.
 void SimpleErrorBox(gfx::NativeWindow parent,
                     const string16& title,
                     const string16& message);
 
+// Pops up a dialog box with two buttons (Yes/No), with the default button of
+// Yes. If |parent| is non-null, the box will be modal on it. (On Mac, it is
+// always app-modal.) Returns true if the Yes button was chosen.
+bool SimpleYesNoBox(gfx::NativeWindow parent,
+                    const string16& title,
+                    const string16& message);
+
 // Return a human readable modifier for the version string.  For a
 // branded Chrome (not Chromium), this modifier is the channel (dev,
 // beta, but "" for stable).
 string16 GetVersionStringModifier();
 
 }
 
 #endif  // CHROME_BROWSER_PLATFORM_UTIL_H_