Allow the default browser check to return "unknown" and reflect that in the UI.

chrome/browser/views/options/general_page_view.cc

 // 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.
 
 #include "chrome/browser/views/options/general_page_view.h"
 
 #include "app/combobox_model.h"
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/gfx/png_decoder.h"
@@ skipping 628 matching lines @@
   View::Layout();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // GeneralPageView, private:
 
 void GeneralPageView::SetDefaultBrowserUIState(
     ShellIntegration::DefaultBrowserUIState state) {
   bool button_enabled = state == ShellIntegration::STATE_NOT_DEFAULT;
   default_browser_use_as_default_button_->SetEnabled(button_enabled);
-  if (state == ShellIntegration::STATE_DEFAULT) {
+  if (state == ShellIntegration::STATE_IS_DEFAULT) {
     default_browser_status_label_->SetText(
       l10n_util::GetStringF(IDS_OPTIONS_DEFAULTBROWSER_DEFAULT,
                             l10n_util::GetString(IDS_PRODUCT_NAME)));
     default_browser_status_label_->SetColor(kDefaultBrowserLabelColor);
     Layout();
   } else if (state == ShellIntegration::STATE_NOT_DEFAULT) {
     default_browser_status_label_->SetText(
         l10n_util::GetStringF(IDS_OPTIONS_DEFAULTBROWSER_NOTDEFAULT,
                               l10n_util::GetString(IDS_PRODUCT_NAME)));
     default_browser_status_label_->SetColor(kNotDefaultBrowserLabelColor);
     Layout();
+  } else if (state == ShellIntegration::STATE_UNKNOWN) {
+    default_browser_status_label_->SetText(
+        l10n_util::GetStringF(IDS_OPTIONS_DEFAULTBROWSER_UNKNOWN,
+                              l10n_util::GetString(IDS_PRODUCT_NAME)));
+    default_browser_status_label_->SetColor(kNotDefaultBrowserLabelColor);
+    Layout();
   }
 }
 
 void GeneralPageView::InitStartupGroup() {
   startup_homepage_radio_ = new views::RadioButton(
       l10n_util::GetString(IDS_OPTIONS_STARTUP_SHOW_DEFAULT_AND_NEWTAB),
       kStartupRadioGroup);
   startup_homepage_radio_->set_listener(this);
   startup_last_session_radio_ = new views::RadioButton(
       l10n_util::GetString(IDS_OPTIONS_STARTUP_SHOW_LAST_SESSION),
@@ skipping 301 matching lines @@
     homepage_use_url_textfield_->SetEnabled(false);
     homepage_use_url_textfield_->SetReadOnly(true);
   }
 }
 
 void GeneralPageView::SetDefaultSearchProvider() {
   const int index = default_search_engine_combobox_->selected_item();
   default_search_engines_model_->model()->SetDefaultSearchProvider(
       default_search_engines_model_->GetTemplateURLAt(index));
 }