cc: Remove cc::Thread and cc::ThreadImpl.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 55c33858686b5730a68d5dab7bbe9f0dc6f54760..e60ec94fc812ee6591e73b1151598b78c84062f3 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -13,7 +13,6 @@
 #include "base/synchronization/lock.h"
 #include "base/time.h"
 #include "cc/base/switches.h"
-#include "cc/base/thread_impl.h"
 #include "cc/debug/layer_tree_debug_state.h"
 #include "cc/layers/layer.h"
 #include "cc/trees/layer_tree_host.h"
@@ -361,17 +360,11 @@ void RenderWidgetCompositor::SetLatencyInfo(
 }
 
 bool RenderWidgetCompositor::initialize(cc::LayerTreeSettings settings) {
-  scoped_ptr<cc::Thread> impl_thread;
   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy =
       RenderThreadImpl::current()->compositor_message_loop_proxy();
-  threaded_ = !!compositor_message_loop_proxy.get();
-  if (threaded_) {
-    impl_thread = cc::ThreadImpl::CreateForDifferentThread(
-        compositor_message_loop_proxy);
-  }
   layer_tree_host_ = cc::LayerTreeHost::Create(this,
                                                settings,
-                                               impl_thread.Pass());
+                                               compositor_message_loop_proxy);
   return layer_tree_host_;
 }