Implement the Windows desktop search redirection feature.

components/search_engines/desktop_search_infobar_delegate_win.h

Index: components/search_engines/desktop_search_infobar_delegate_win.h
diff --git a/components/search_engines/desktop_search_infobar_delegate_win.h b/components/search_engines/desktop_search_infobar_delegate_win.h
new file mode 100644
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+++ b/components/search_engines/desktop_search_infobar_delegate_win.h
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+// Copyright 2016 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 COMPONENTS_SEARCH_ENGINES_DESKTOP_SEARCH_INFOBAR_DELEGATE_WIN_H_
+#define COMPONENTS_SEARCH_ENGINES_DESKTOP_SEARCH_INFOBAR_DELEGATE_WIN_H_
+
+#include "base/gtest_prod_util.h"
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "components/infobars/core/confirm_infobar_delegate.h"
+#include "url/gurl.h"
+
+namespace infobars {
+class InfoBarManager;
+}  // namespace infobars
+
+// The delegate for the infobar informing the user that a Windows desktop search
+// has been redirected to the default search engine.
+class WindowsDesktopSearchInfobarDelegate : public ConfirmInfoBarDelegate {
+ public:
+  // Adds to |infobar_manager| an infobar informing the user that a Windows
+  // desktop search has been redirected to the default search engine.
+  // |default_search_engine_name| is the name of the default search engine.
+  // |search_settings_url| is the URL of the search settings.
+  static void Show(infobars::InfoBarManager* infobar_manager,
+                   const base::string16& default_search_engine_name,
+                   const GURL& search_settings_url);
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(WindowsDesktopSearchInfobarDelegateTest,
+                           ManageSearchSettings);
+
+  WindowsDesktopSearchInfobarDelegate(
+      const base::string16& default_search_engine_name,
+      const GURL& search_settings_url);
+  virtual ~WindowsDesktopSearchInfobarDelegate();
+
+  // ConfirmInfoBarDelegate:
+  base::string16 GetMessageText() const override;
+  int GetButtons() const override;
+  base::string16 GetButtonLabel(InfoBarButton button) const override;
+  bool Accept() override;
+
+  // infobars::InfoBarDelegate:
+  infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
+  void InfoBarDismissed() override;
+
+  base::string16 default_search_engine_name_;
+  GURL search_settings_url_;
+
+  // True when the infobar has been closed by clicking on the close button.
+  bool closed_by_user_;
+
+  DISALLOW_COPY_AND_ASSIGN(WindowsDesktopSearchInfobarDelegate);
+};
+
+#endif  // COMPONENTS_SEARCH_ENGINES_DESKTOP_SEARCH_INFOBAR_DELEGATE_WIN_H_