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

ios/chrome/browser/search_engines/ui_thread_search_terms_data.h

 // 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 IOS_CHROME_BROWSER_SEARCH_ENGINES_UI_THREAD_SEARCH_TERMS_DATA_H_
 #define IOS_CHROME_BROWSER_SEARCH_ENGINES_UI_THREAD_SEARCH_TERMS_DATA_H_
 
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "components/search_engines/search_terms_data.h"
 
 namespace ios {
 
 class ChromeBrowserState;
 
 // Implementation of SearchTermsData that is only usable on UI thread.
 class UIThreadSearchTermsData : public SearchTermsData {
  public:
   explicit UIThreadSearchTermsData(ios::ChromeBrowserState* browser_state);
   ~UIThreadSearchTermsData() override;
 
   // SearchTermsData implementation.
   std::string GoogleBaseURLValue() const override;
   std::string GetApplicationLocale() const override;
   base::string16 GetRlzParameterValue(bool from_app_list) const override;
   std::string GetSearchClient() const override;
   std::string GetSuggestClient() const override;
   std::string GetSuggestRequestIdentifier() const override;
-  bool IsShowingSearchTermsOnSearchResultsPages() const override;
   std::string InstantExtendedEnabledParam(bool for_search) const override;
   std::string ForceInstantResultsParam(bool for_prerender) const override;
-  int OmniboxStartMargin() const override;
-  std::string NTPIsThemedParam() const override;
   std::string IOSWebViewTypeParam() const override;
   std::string GoogleImageSearchSource() const override;
 
  private:
   base::ThreadChecker thread_checker_;
   ios::ChromeBrowserState* browser_state_;
 
   DISALLOW_COPY_AND_ASSIGN(UIThreadSearchTermsData);
 };
 
 }  // namespace ios
 
 #endif  // IOS_CHROME_BROWSER_SEARCH_ENGINES_UI_THREAD_SEARCH_TERMS_DATA_H_