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

cc/layers/texture_layer.cc

Index: cc/layers/texture_layer.cc
diff --git a/cc/layers/texture_layer.cc b/cc/layers/texture_layer.cc
index d09963139101e955de76cb914513e31d51777b6f..7e89bb9c15fd66b49a6095d7641e7116ebc22bef 100644
--- a/cc/layers/texture_layer.cc
+++ b/cc/layers/texture_layer.cc
@@ -4,7 +4,8 @@
 
 #include "cc/layers/texture_layer.h"
 
-#include "cc/base/thread.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
 #include "cc/layers/texture_layer_client.h"
 #include "cc/layers/texture_layer_impl.h"
 #include "cc/trees/layer_tree_host.h"
@@ -22,13 +23,14 @@ void RunCallback(
 }
 
 void PostCallbackToThread(
-    Thread* thread,
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     const TextureMailbox::ReleaseCallback& callback,
     unsigned sync_point,
     bool lost_resource) {
   if (!callback.is_null()) {
-    thread->PostTask(base::Bind(&RunCallback, callback,
-                                sync_point, lost_resource));
+    task_runner->PostTask(FROM_HERE,
+                          base::Bind(&RunCallback, callback,
+                                     sync_point, lost_resource));
   }
 }
 
@@ -214,9 +216,12 @@ void TextureLayer::PushPropertiesTo(LayerImpl* layer) {
   texture_layer->set_vertex_opacity(vertex_opacity_);
   texture_layer->set_premultiplied_alpha(premultiplied_alpha_);
   if (uses_mailbox_ && own_mailbox_) {
-    Thread* main_thread = layer_tree_host()->proxy()->MainThread();
+    scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner =
+        layer_tree_host()->proxy()->MainThreadTaskRunner();
     TextureMailbox::ReleaseCallback callback = base::Bind(
-        &PostCallbackToThread, main_thread, texture_mailbox_.callback());
+        &PostCallbackToThread,
+        main_thread_task_runner,
+        texture_mailbox_.callback());
     texture_layer->SetTextureMailbox(
         texture_mailbox_.CopyWithNewCallback(callback));
     own_mailbox_ = false;