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

components/search/search.cc

 // 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.
 
 #include "components/search/search.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 53 matching lines @@
 #if defined(OS_ANDROID)
 const char kPrefetchSearchResultsFlagName[] = "prefetch_results";
 
 // Controls whether to reuse prerendered Instant Search base page to commit any
 // search query.
 const char kReuseInstantSearchBasePage[] = "reuse_instant_search_base_page";
 #endif
 
 }  // namespace
 
-// Negative start-margin values prevent the "es_sm" parameter from being used.
-const int kDisableStartMargin = -1;
-
 bool IsInstantExtendedAPIEnabled() {
 #if defined(OS_IOS)
   return false;
 #elif defined(OS_ANDROID)
   return EmbeddedSearchPageVersion() == kEmbeddedSearchEnabledVersion;
 #else
   return true;
 #endif  // defined(OS_IOS)
 }
 
@@ skipping 164 matching lines @@
 }
 
 void EnableQueryExtractionForTesting() {
 #if !defined(OS_IOS) && !defined(OS_ANDROID)
   base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
   cl->AppendSwitch(switches::kEnableQueryExtraction);
 #endif
 }
 
 }  // namespace search