[Mac] Allow omnibox decorations to decline mouse events.

chrome/browser/cocoa/location_bar/location_icon_decoration.h

 // Copyright (c) 2010 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_COCOA_LOCATION_BAR_LOCATION_ICON_DECORATION_H_
 #define CHROME_BROWSER_COCOA_LOCATION_BAR_LOCATION_ICON_DECORATION_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "chrome/browser/cocoa/location_bar/image_decoration.h"
 
 class LocationBarViewMac;
 
 // LocationIconDecoration is used to display an icon to the left of
 // the address.
 
 class LocationIconDecoration : public ImageDecoration {
  public:
   explicit LocationIconDecoration(LocationBarViewMac* owner);
   virtual ~LocationIconDecoration();
 
   // Allow dragging the current URL.
   virtual bool IsDraggable();
   virtual NSPasteboard* GetDragPasteboard();
   virtual NSImage* GetDragImage() { return GetImage(); }
 
   // Show the page info panel on click.
   virtual bool OnMousePressed(NSRect frame);
+  virtual bool AcceptsMousePress() { return true; }
 
  private:
   // The location bar view that owns us.
   LocationBarViewMac* owner_;
 
   DISALLOW_COPY_AND_ASSIGN(LocationIconDecoration);
 };
 
 #endif  // CHROME_BROWSER_COCOA_LOCATION_BAR_LOCATION_ICON_DECORATION_H_