cc: Move worker threads to content.

cc/resources/tile_task_worker_pool.h

Index: cc/resources/tile_task_worker_pool.h
diff --git a/cc/resources/tile_task_worker_pool.h b/cc/resources/tile_task_worker_pool.h
index 915a3fa0a8ca2afe9e07644fb13e6cb906a40323..90adfd1ab05e4ffa7106cfc00539d219763fd8e0 100644
--- a/cc/resources/tile_task_worker_pool.h
+++ b/cc/resources/tile_task_worker_pool.h
@@ -5,7 +5,6 @@
 #ifndef CC_RESOURCES_TILE_TASK_WORKER_POOL_H_
 #define CC_RESOURCES_TILE_TASK_WORKER_POOL_H_
 
-#include "base/threading/platform_thread.h"
 #include "cc/resources/tile_task_runner.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
@@ -27,20 +26,6 @@ class CC_EXPORT TileTaskWorkerPool {
   TileTaskWorkerPool();
   virtual ~TileTaskWorkerPool();
 
-  // Set the number of threads to use for the global TaskGraphRunner instance.
-  // This can only be called once and must be called prior to
-  // GetNumWorkerThreads().
-  static void SetNumWorkerThreads(int num_threads);
-
-  // Returns the number of threads used for the global TaskGraphRunner instance.
-  static int GetNumWorkerThreads();
-
-  // Set the priority of worker threads.
-  static void SetWorkerThreadPriority(base::ThreadPriority priority);
-
-  // Returns a pointer to the global TaskGraphRunner instance.
-  static TaskGraphRunner* GetTaskGraphRunner();
-
   // Utility function that can be used to create a "Task set finished" task that
   // posts |callback| to |task_runner| when run.
   static scoped_refptr<TileTask> CreateTaskSetFinishedTask(