Remove image_decode_tasks_enabled flag.

cc/trees/layer_tree_host.cc

 // Copyright 2011 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/trees/layer_tree_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 90 matching lines @@
       rendering_stats_instrumentation_(RenderingStatsInstrumentation::Create()),
       settings_(*params->settings),
       debug_state_(settings_.initial_debug_state),
       id_(s_layer_tree_host_sequence_number.GetNext() + 1),
       task_graph_runner_(params->task_graph_runner),
       content_source_id_(0),
       event_listener_properties_(),
       mutator_host_(params->mutator_host) {
   DCHECK(task_graph_runner_);
   DCHECK(!settings_.enable_checker_imaging || image_worker_task_runner_);
-  DCHECK(!settings_.enable_checker_imaging ||
-         settings_.image_decode_tasks_enabled);
 
   mutator_host_->SetMutatorHostClient(this);
 
   rendering_stats_instrumentation_->set_record_rendering_stats(
       debug_state_.RecordRenderingStats());
 }
 
 void LayerTreeHost::InitializeThreaded(
     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner) {
@@ skipping 1318 matching lines @@
 void LayerTreeHost::SetNeedsDisplayOnAllLayers() {
   for (auto* layer : *this)
     layer->SetNeedsDisplay();
 }
 
 void LayerTreeHost::SetHasCopyRequest(bool has_copy_request) {
   has_copy_request_ = has_copy_request;
 }
 
 }  // namespace cc