Remove material design resource pak infrastructure

ui/base/resource/resource_handle.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 UI_BASE_RESOURCE_RESOURCE_HANDLE_H_
 #define UI_BASE_RESOURCE_RESOURCE_HANDLE_H_
 
 #include <stdint.h>
 
 #include "base/strings/string_piece.h"
@@ skipping 30 matching lines @@
   // Caller owns the returned object.
   virtual base::RefCountedStaticMemory* GetStaticMemory(
       uint16_t resource_id) const = 0;
 
   // Get the encoding type of text resources.
   virtual TextEncodingType GetTextEncodingType() const = 0;
 
   // The scale of images in this resource pack relative to images in the 1x
   // resource pak.
   virtual ScaleFactor GetScaleFactor() const = 0;
-
-  // Returns true if the only resources contained within this DataPack are
-  // material design image assets.
-  virtual bool HasOnlyMaterialDesignAssets() const = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_RESOURCE_RESOURCE_HANDLE_H_