Remove a variety of no-longer-used query params.

components/search/search.h

 // Copyright 2014 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_SEARCH_H_
 #define COMPONENTS_SEARCH_SEARCH_H_
 
 #include <stdint.h>
 
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/strings/string16.h"
 #include "base/strings/string_split.h"
 
 class GURL;
 class TemplateURL;
 
 namespace search {
 
-// Use this value for "start margin" to prevent the "es_sm" parameter from
-// being used.
-extern const int kDisableStartMargin;
-
 // Returns whether the Instant Extended API is enabled.
 bool IsInstantExtendedAPIEnabled();
 
 // Returns the value to pass to the &espv CGI parameter when loading the
 // embedded search page from the user's default search provider. Returns 0 if
 // the Instant Extended API is not enabled.
 uint64_t EmbeddedSearchPageVersion();
 
 // Type for a collection of experiment configuration parameters.
 typedef base::StringPairs FieldTrialFlags;
@@ skipping 69 matching lines @@
 // -----------------------------------------------------
 // The following APIs are exposed for use in tests only.
 // -----------------------------------------------------
 
 // Forces query in the omnibox to be on for tests.
 void EnableQueryExtractionForTesting();
 
 }  // namespace search
 
 #endif  // COMPONENTS_SEARCH_SEARCH_H_