cocoa browser: remove remaining non-MD code

chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.mm

 // 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.
 
 #include "chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "chrome/browser/favicon/favicon_utils.h"
 #include "skia/ext/skia_utils_mac.h"
 #include "ui/base/material_design/material_design_controller.h"
-#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia_util_mac.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/vector_icons_public.h"
 #include "ui/resources/grit/ui_resources.h"
 
 namespace {
 
 const CGFloat kVectorIconSize = 16;
 
 }  // namespace
 
 namespace mac {
 
 NSImage* FaviconForWebContents(content::WebContents* contents, SkColor color) {
   if (contents) {
     NSImage* image = favicon::TabFaviconFromWebContents(contents).AsNSImage();
 
     // The |image| could be nil if the bitmap is null. In that case, fallback
     // to the default image.
     if (image)
       return image;
   }
 
-  if (ui::MaterialDesignController::IsModeMaterial()) {
-    return NSImageFromImageSkia(gfx::CreateVectorIcon(
-        gfx::VectorIconId::DEFAULT_FAVICON, kVectorIconSize, color));
-  }
-
-  ResourceBundle& rb = ResourceBundle::GetSharedInstance();
-  return rb.GetNativeImageNamed(IDR_DEFAULT_FAVICON).ToNSImage();
+  return NSImageFromImageSkia(gfx::CreateVectorIcon(
+      gfx::VectorIconId::DEFAULT_FAVICON, kVectorIconSize, color));
 }
 
 }  // namespace mac