Remove unused param "width_" from SearchBox::OnMarginChange().

chrome/renderer/searchbox/searchbox.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 CHROME_RENDERER_SEARCHBOX_SEARCHBOX_H_
 #define CHROME_RENDERER_SEARCHBOX_SEARCHBOX_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 100 matching lines @@
 
  private:
   // Overridden from content::RenderViewObserver:
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   void OnChromeIdentityCheckResult(const base::string16& identity,
                                    bool identity_match);
   void OnDetermineIfPageSupportsInstant();
   void OnFocusChanged(OmniboxFocusState new_focus_state,
                       OmniboxFocusChangeReason reason);
-  void OnMarginChange(int margin, int width);
+  void OnMarginChange(int margin);
   void OnMostVisitedChanged(
       const std::vector<InstantMostVisitedItem>& items);
   void OnPromoInformationReceived(bool is_app_launcher_enabled);
   void OnSetDisplayInstantResults(bool display_instant_results);
   void OnSetInputInProgress(bool input_in_progress);
   void OnSetSuggestionToPrefetch(const InstantSuggestion& suggestion);
   void OnSubmit(const base::string16& query);
   void OnThemeChanged(const ThemeBackgroundInfo& theme_info);
   void OnToggleVoiceSearch();
 
   // Returns the current zoom factor of the render view or 1 on failure.
   double GetZoom() const;
 
   // Sets the searchbox values to their initial value.
   void Reset();
 
   // Returns the URL of the Most Visited item specified by the |item_id|.
   GURL GetURLForMostVisitedItem(InstantRestrictedID item_id) const;
 
   bool app_launcher_enabled_;
   bool is_focused_;
   bool is_input_in_progress_;
   bool is_key_capture_enabled_;
   bool display_instant_results_;
   InstantRestrictedIDCache<InstantMostVisitedItem> most_visited_items_cache_;
   ThemeBackgroundInfo theme_info_;
   base::string16 query_;
   int start_margin_;
   InstantSuggestion suggestion_;
-  int width_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchBox);
 };
 
 #endif  // CHROME_RENDERER_SEARCHBOX_SEARCHBOX_H_