mac: Let task manager use IDR_PRODUCT_LOGO_16 instead of NSApplicationIcon.

ui/gfx/image/image_skia_util_mac.h

Index: ui/gfx/image/image_skia_util_mac.h
diff --git a/ui/gfx/image/image_skia_util_mac.h b/ui/gfx/image/image_skia_util_mac.h
index 553c3f8741dd0403eb5e720da51ec45b5ad6b6fe..fc6a65fb027ca7c419d2a4816f5282858f5c46e0 100644
--- a/ui/gfx/image/image_skia_util_mac.h
+++ b/ui/gfx/image/image_skia_util_mac.h
@@ -31,10 +31,6 @@ GFX_EXPORT gfx::ImageSkia ImageSkiaFromNSImage(NSImage* image);
 GFX_EXPORT gfx::ImageSkia ImageSkiaFromResizedNSImage(NSImage* image,
                                                       NSSize size);
 
-// Resizes |[NSImage imageNamed:@NSApplicationIcon]| to have edge width of
-// |size| DIP and returns result as ImageSkia.
-GFX_EXPORT gfx::ImageSkia ApplicationIconAtSize(int size);
-
 // Converts to NSImage from ImageSkia.
 GFX_EXPORT NSImage* NSImageFromImageSkia(const gfx::ImageSkia& image_skia);