Remove a couple desktop infobar png assets.

chrome/browser/ui/omnibox/alternate_nav_infobar_delegate.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_BROWSER_UI_OMNIBOX_ALTERNATE_NAV_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_UI_OMNIBOX_ALTERNATE_NAV_INFOBAR_DELEGATE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 30 matching lines @@
                               const AutocompleteMatch& match,
                               const GURL& search_url);
 
   // Returns an alternate nav infobar that owns |delegate|.
   static std::unique_ptr<infobars::InfoBar> CreateInfoBar(
       std::unique_ptr<AlternateNavInfoBarDelegate> delegate);
 
   // InfoBarDelegate:
   Type GetInfoBarType() const override;
   infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
-  int GetIconId() const override;
   gfx::VectorIconId GetVectorIconId() const override;
 
   Profile* profile_;
   const base::string16 text_;
   const AutocompleteMatch match_;
   const GURL search_url_;
 
   DISALLOW_COPY_AND_ASSIGN(AlternateNavInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_OMNIBOX_ALTERNATE_NAV_INFOBAR_DELEGATE_H_