color: Remove implied color space

cc/blink/web_display_item_list_impl.cc

 // 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.
 
 #include "cc/blink/web_display_item_list_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <vector>
@@ skipping 133 matching lines @@
 }
 
 void WebDisplayItemListImpl::appendEndScrollItem() {
   appendEndTransformItem();
 }
 
 void WebDisplayItemListImpl::setIsSuitableForGpuRasterization(bool isSuitable) {
   display_item_list_->SetIsSuitableForGpuRasterization(isSuitable);
 }
 
-void WebDisplayItemListImpl::setImpliedColorSpace(
-    const gfx::ColorSpace& implied_color_space) {
-  display_item_list_->SetImpliedColorSpace(implied_color_space);
-}
-
 WebDisplayItemListImpl::~WebDisplayItemListImpl() {
 }
 
 }  // namespace cc_blink