chrome://restart implemented.

chrome/browser/browser_about_handler.cc

Index: chrome/browser/browser_about_handler.cc
diff --git a/chrome/browser/browser_about_handler.cc b/chrome/browser/browser_about_handler.cc
index 049ce221c9791a80d148426c00418f3926edd322..bb2c0c524c03abc3d990f402350c75edeff75c4a 100644
--- a/chrome/browser/browser_about_handler.cc
+++ b/chrome/browser/browser_about_handler.cc
@@ -11,6 +11,7 @@
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "base/strings/string_util.h"
+#include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/net/url_fixer_upper.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/common/chrome_switches.h"
@@ -156,6 +157,8 @@ bool WillHandleBrowserAboutURL(GURL* url,
   } else if (host == chrome::kChromeUIHelpHost) {
     host = chrome::kChromeUIUberHost;
     path = chrome::kChromeUIHelpHost + url->path();
+  } else if (host == chrome::kChromeUIRestartHost) {
+    chrome::AttemptRestart();
   }
   GURL::Replacements replacements;
   replacements.SetHostStr(host);