[Material][Mac] Set Incognito Omnibox Dropdown Icons to White

chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h

 // Copyright (c) 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_COCOA_OMNIBOX_OMNIBOX_POPUP_VIEW_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_OMNIBOX_OMNIBOX_POPUP_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <stddef.h>
 
@@ skipping 35 matching lines @@
   void PaintUpdatesNow() override;
   void OnDragCanceled() override {}
 
   // Overridden from OmniboxPopupMatrixDelegate:
   void OnMatrixRowSelected(OmniboxPopupMatrix* matrix, size_t row) override;
   void OnMatrixRowClicked(OmniboxPopupMatrix* matrix, size_t row) override;
   void OnMatrixRowMiddleClicked(OmniboxPopupMatrix* matrix,
                                 size_t row) override;
 
   // Returns the NSImage that should be used as an icon for the given match.
-  NSImage* ImageForMatch(const AutocompleteMatch& match,
-                         BOOL ignore_dark_theme) const;
+  NSImage* ImageForMatch(const AutocompleteMatch& match) const;
 
   OmniboxPopupMatrix* matrix() { return matrix_; }
 
  protected:
   // Gets the autocomplete results. This is virtual so that it can be overridden
   // by tests.
   virtual const AutocompleteResult& GetResult() const;
 
  private:
   // Create the popup_ instance if needed.
@@ skipping 20 matching lines @@
 
   base::scoped_nsobject<OmniboxPopupMatrix> matrix_;
   base::scoped_nsobject<NSView> top_separator_view_;
   base::scoped_nsobject<NSView> bottom_separator_view_;
   base::scoped_nsobject<NSBox> background_view_;
 
   DISALLOW_COPY_AND_ASSIGN(OmniboxPopupViewMac);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_OMNIBOX_OMNIBOX_POPUP_VIEW_MAC_H_