Add a preference to control Windows desktop search redirection.

components/search_engines/detect_desktop_search_win.h

Index: components/search_engines/detect_desktop_search_win.h
diff --git a/components/search_engines/detect_desktop_search_win.h b/components/search_engines/detect_desktop_search_win.h
deleted file mode 100644
index 3d648a62df568ca4fee302fd0efa3f4ec4658082..0000000000000000000000000000000000000000
--- a/components/search_engines/detect_desktop_search_win.h
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2015 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_DETECT_DESKTOP_SEARCH_WIN_H_
-#define COMPONENTS_SEARCH_ENGINES_DETECT_DESKTOP_SEARCH_WIN_H_
-
-#include "base/strings/string16.h"
-
-class GURL;
-class SearchTermsData;
-
-// Detects whether a URL comes from a Windows Desktop search. If so, puts the
-// search terms in |search_terms| and returns true.
-bool DetectWindowsDesktopSearch(const GURL& url,
-                                const SearchTermsData& search_terms_data,
-                                base::string16* search_terms);
-
-#endif  // COMPONENTS_SEARCH_ENGINES_DETECT_DESKTOP_SEARCH_WIN_H_