cc: Remove the LayerTreeHost abstraction.

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index fb0fe72e4786b2f078102bc32582b471bf288cef..236560dd737d45dd57831516280dfa0c4fcc421e 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -30,7 +30,7 @@
 #include "cc/scheduler/begin_frame_source.h"
 #include "cc/surfaces/surface_id_allocator.h"
 #include "cc/surfaces/surface_manager.h"
-#include "cc/trees/layer_tree_host_in_process.h"
+#include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_settings.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/compositor/compositor_observer.h"
@@ -193,13 +193,13 @@ Compositor::Compositor(const cc::FrameSinkId& frame_sink_id,
 
   animation_host_ = cc::AnimationHost::CreateMainInstance();
 
-  cc::LayerTreeHostInProcess::InitParams params;
+  cc::LayerTreeHost::InitParams params;
   params.client = this;
   params.task_graph_runner = context_factory_->GetTaskGraphRunner();
   params.settings = &settings;
   params.main_task_runner = task_runner_;
   params.mutator_host = animation_host_.get();
-  host_ = cc::LayerTreeHostInProcess::CreateSingleThreaded(this, &params);
+  host_ = cc::LayerTreeHost::CreateSingleThreaded(this, &params);
   UMA_HISTOGRAM_TIMES("GPU.CreateBrowserCompositor",
                       base::TimeTicks::Now() - before_create);