Session restore shouldn't care about profile home pages.

chrome/browser/extensions/extension_tab_util.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_tab_util.h"
 
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/extensions/api/tabs/tabs_constants.h"
@@ skipping 148 matching lines @@
                                       NULL)) {
       // TODO(rpaquay): Error message?
       return NULL;
     }
   }
 
   // TODO(rafaelw): handle setting remaining tab properties:
   // -title
   // -favIconUrl
 
-  std::string url_string;
   GURL url;
   if (params.url.get()) {
-    url_string = *params.url;
+    std::string url_string= *params.url;
     url = ExtensionTabUtil::ResolvePossiblyRelativeURL(
         url_string, function->GetExtension());
     if (!url.is_valid()) {
       *error =
           ErrorUtils::FormatErrorMessage(keys::kInvalidUrlError, url_string);
       return NULL;
     }
+  } else {
+    url = GURL(chrome::kChromeUINewTabURL);
   }
 
   // Don't let extensions crash the browser or renderers.
   if (ExtensionTabUtil::IsCrashURL(url)) {
     *error = keys::kNoCrashBrowserError;
     return NULL;
   }
 
   // Default to foreground for the new tab. The presence of 'active' property
   // will override this default.
@@ skipping 380 matching lines @@
                                 content::PAGE_TRANSITION_LINK,
                                 false);
   browser->OpenURL(params);
   browser->window()->Show();
   WebContents* web_contents =
       browser->tab_strip_model()->GetActiveWebContents();
   web_contents->GetDelegate()->ActivateContents(web_contents);
 }
 
 }  // namespace extensions