Links in platform apps should open in the system default browser.

chrome/browser/shell_integration_linux.h

 // 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.
 
 #ifndef CHROME_BROWSER_SHELL_INTEGRATION_LINUX_H_
 #define CHROME_BROWSER_SHELL_INTEGRATION_LINUX_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 41 matching lines @@
 // For extensions, duplicate shortcuts are avoided, so if a requested shortcut
 // already exists it is deleted first.
 bool CreateDesktopShortcut(const ShellIntegration::ShortcutInfo& shortcut_info,
                            const std::string& shortcut_template);
 
 // Delete any desktop shortcuts on desktop or in the application menu that have
 // been added for the extension with |extension_id| in |profile_path|.
 void DeleteDesktopShortcuts(const FilePath& profile_path,
                             const std::string& extension_id);
 
+// Launch the default system browser to navigate url.
+void LaunchDefaultBrowser(const GURL& url);
+
 }  // namespace ShellIntegrationLinux
 
 #endif  // CHROME_BROWSER_SHELL_INTEGRATION_LINUX_H_