Remove image_decode_tasks_enabled flag.

content/test/fake_compositor_dependencies.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 "content/test/fake_compositor_dependencies.h"
 
 #include <stddef.h>
 
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 62 matching lines @@
 
 blink::scheduler::RendererScheduler*
 FakeCompositorDependencies::GetRendererScheduler() {
   return &renderer_scheduler_;
 }
 
 cc::TaskGraphRunner* FakeCompositorDependencies::GetTaskGraphRunner() {
   return &task_graph_runner_;
 }
 
-bool FakeCompositorDependencies::AreImageDecodeTasksEnabled() {
-  return false;
-}
-
 bool FakeCompositorDependencies::IsThreadedAnimationEnabled() {
   return true;
 }
 
 bool FakeCompositorDependencies::IsScrollAnimatorEnabled() {
   return false;
 }
 
 bool FakeCompositorDependencies::IsSurfaceSynchronizationEnabled() {
   return false;
 }
 
 }  // namespace content