[Mac][Material Design] Update Omnibox dropdown on Mac to MD

chrome/browser/ui/cocoa/location_bar/zoom_decoration.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_LOCATION_BAR_ZOOM_DECORATION_H_
 #define CHROME_BROWSER_UI_COCOA_LOCATION_BAR_ZOOM_DECORATION_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/macros.h"
@@ skipping 34 matching lines @@
   // Hides all UI associated with the zoom decoration.
   // Virtual and protected for testing.
   virtual void HideUI();
 
   // Show and update UI associated with the zoom decoration.
   // Virtual and protected for testing.
   virtual void ShowAndUpdateUI(ui_zoom::ZoomController* zoom_controller,
                                NSString* tooltip_string,
                                bool location_bar_is_dark);
 
+  // Overridden from LocationBarDecoration:
+  gfx::VectorIconId GetMaterialVectorIconId() override;
+
  private:
   friend ZoomDecorationTest;
 
   bool IsAtDefaultZoom() const;
 
   // Virtual for testing.
   virtual bool ShouldShowDecoration() const;
 
   // LocationBarDecoration implementation.
   bool AcceptsMousePress() override;
   bool OnMousePressed(NSRect frame, NSPoint location) override;
   NSString* GetToolTip() override;
   NSPoint GetBubblePointInFrame(NSRect frame) override;
 
   // ZoomBubbleControllerDelegate implementation.
   content::WebContents* GetWebContents() override;
   void OnClose() override;
 
   // The control that owns this. Weak.
   LocationBarViewMac* owner_;
 
   // The bubble that this decoration shows. Weak, owns self.
   ZoomBubbleController* bubble_;
 
   // The string to show for a tooltip.
   base::scoped_nsobject<NSString> tooltip_;
 
+  gfx::VectorIconId vector_icon_id_;
+
   DISALLOW_COPY_AND_ASSIGN(ZoomDecoration);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_LOCATION_BAR_ZOOM_DECORATION_H_