[Mac][Material Design] Show light default favicon in Incognito mode.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h
index ec6646f920dee41db14014af1b79aabb068b7c55..6241a76133fff54153af970914148abce7bb949b 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h
@@ -203,6 +203,9 @@ willAnimateFromState:(BookmarkBar::State)oldState
   // The default image, so we can use one copy for all buttons.
   base::scoped_nsobject<NSImage> defaultImage_;
 
+  // The Incognito version of the default image.
+  base::scoped_nsobject<NSImage> defaultImageIncognito_;
+
   // If the bar is disabled, we hide it and ignore show/hide commands.
   // Set when using fullscreen mode.
   BOOL barIsEnabled_;