Revert of cc: Add image decode queue functionality to image manager.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index cadc4578e9807d93fb0852b00a2f39f0ae9a60c5..9d01bd653cb692523f0cfccf3bcc9f098ad0f097 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -190,12 +190,10 @@
     RenderingStatsInstrumentation* rendering_stats_instrumentation,
     TaskGraphRunner* task_graph_runner,
     std::unique_ptr<MutatorHost> mutator_host,
-    int id,
-    scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner) {
+    int id) {
   return base::WrapUnique(new LayerTreeHostImpl(
       settings, client, task_runner_provider, rendering_stats_instrumentation,
-      task_graph_runner, std::move(mutator_host), id,
-      std::move(image_worker_task_runner)));
+      task_graph_runner, std::move(mutator_host), id));
 }
 
 LayerTreeHostImpl::LayerTreeHostImpl(
@@ -205,8 +203,7 @@
     RenderingStatsInstrumentation* rendering_stats_instrumentation,
     TaskGraphRunner* task_graph_runner,
     std::unique_ptr<MutatorHost> mutator_host,
-    int id,
-    scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner)
+    int id)
     : client_(client),
       task_runner_provider_(task_runner_provider),
       current_begin_frame_tracker_(BEGINFRAMETRACKER_FROM_HERE),
@@ -232,7 +229,6 @@
       // task_runner_provider_.
       tile_manager_(this,
                     GetTaskRunner(),
-                    std::move(image_worker_task_runner),
                     is_synchronous_single_threaded_
                         ? std::numeric_limits<size_t>::max()
                         : settings.scheduled_raster_task_limit,
@@ -277,8 +273,6 @@
   browser_controls_offset_manager_ = BrowserControlsOffsetManager::Create(
       this, settings.top_controls_show_threshold,
       settings.top_controls_hide_threshold);
-
-  tile_manager_.SetDecodedImageTracker(&decoded_image_tracker_);
 }
 
 LayerTreeHostImpl::~LayerTreeHostImpl() {
@@ -1853,7 +1847,6 @@
 
 void LayerTreeHostImpl::DidFinishImplFrame() {
   current_begin_frame_tracker_.Finish();
-  decoded_image_tracker_.NotifyFrameFinished();
 }
 
 void LayerTreeHostImpl::UpdateViewportContainerSizes() {