color: Remove implied color space

cc/blink/web_display_item_list_impl.h

 // Copyright 2014 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 CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_
 #define CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "cc/blink/cc_blink_export.h"
@@ skipping 50 matching lines @@
   void appendFilterItem(const cc::FilterOperations& filters,
                         const blink::WebFloatRect& filter_bounds,
                         const blink::WebFloatPoint& origin) override;
   void appendEndFilterItem() override;
   void appendScrollItem(const blink::WebSize& scrollOffset,
                         ScrollContainerId) override;
   void appendEndScrollItem() override;
 
   void setIsSuitableForGpuRasterization(bool isSuitable) override;
 
-  void setImpliedColorSpace(const gfx::ColorSpace& color_space) override;
-
  private:
   scoped_refptr<cc::DisplayItemList> display_item_list_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDisplayItemListImpl);
 };
 
 }  // namespace cc_blink
 
 #endif  // CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_