Provide a link to restart chrome when changing gpu settings

chrome/browser/ui/webui/options/browser_options_handler.h

Index: chrome/browser/ui/webui/options/browser_options_handler.h
===================================================================
--- chrome/browser/ui/webui/options/browser_options_handler.h	(revision 189066)
+++ chrome/browser/ui/webui/options/browser_options_handler.h	(working copy)
@@ -180,6 +180,9 @@
   // the "Use TLS 1.0" checkbox.
   void HandleUseTLS1Checkbox(const ListValue* args);
 
+  // Callback for the "restartBrowser" message. Restores all tabs on restart.
+  void HandleRestartBrowser(const ListValue* args);
+
 #if !defined(OS_CHROMEOS)
   // Callback for the "showNetworkProxySettings" message. This will invoke
   // an appropriate dialog for configuring proxy settings.