Remove search::GetSearchTerms since it always returns empty string

components/toolbar/toolbar_model_impl.h

 // Copyright 2012 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_TOOLBAR_TOOLBAR_MODEL_IMPL_H_
 #define COMPONENTS_TOOLBAR_TOOLBAR_MODEL_IMPL_H_
 
 #include <stddef.h>
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "components/toolbar/toolbar_model.h"
 #include "url/gurl.h"
 
 class ToolbarModelDelegate;
 
-namespace net {
-class X509Certificate;
-}
-
 // This class is the model used by the toolbar, location bar and autocomplete
 // edit.  It populates its states from the current navigation entry retrieved
 // from the navigation controller returned by GetNavigationController().
 class ToolbarModelImpl : public ToolbarModel {
  public:
   ToolbarModelImpl(ToolbarModelDelegate* delegate,
                    size_t max_url_display_chars);
   ~ToolbarModelImpl() override;
 
  private:
   // ToolbarModel:
   base::string16 GetText() const override;
   base::string16 GetFormattedURL(size_t* prefix_end) const override;
   GURL GetURL() const override;
-  bool WouldPerformSearchTermReplacement(bool ignore_editing) const override;
   security_state::SecurityStateModel::SecurityLevel GetSecurityLevel(
       bool ignore_editing) const override;
   int GetIcon() const override;
   gfx::VectorIconId GetVectorIcon() const override;
   base::string16 GetEVCertName() const override;
   bool ShouldDisplayURL() const override;
 
-  // Returns search terms as in search::GetSearchTerms() if such terms should
-  // appear in the omnibox (i.e. the page is sufficiently secure, search term
-  // replacement is enabled, editing is not in progress, etc.).  If
-  // |ignore_editing| is true, the "editing not in progress" check is skipped.
-  base::string16 GetSearchTerms(bool ignore_editing) const;
-
   ToolbarModelDelegate* delegate_;
   const size_t max_url_display_chars_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ToolbarModelImpl);
 };
 
 #endif  // COMPONENTS_TOOLBAR_TOOLBAR_MODEL_IMPL_H_