cc: Merge TileTaskRunner to TileTaskWorkerPool.

cc/raster/one_copy_tile_task_worker_pool.h

Index: cc/raster/one_copy_tile_task_worker_pool.h
diff --git a/cc/raster/one_copy_tile_task_worker_pool.h b/cc/raster/one_copy_tile_task_worker_pool.h
index 5d6162d64de108fe43146a795ad757de4e405c34..da41020eb2a8269a88ffc64aca348318ba778412 100644
--- a/cc/raster/one_copy_tile_task_worker_pool.h
+++ b/cc/raster/one_copy_tile_task_worker_pool.h
@@ -9,7 +9,6 @@
 
 #include "base/macros.h"
 #include "cc/output/context_provider.h"
-#include "cc/raster/tile_task_runner.h"
 #include "cc/raster/tile_task_worker_pool.h"
 #include "cc/resources/resource_provider.h"
 
@@ -19,7 +18,6 @@ class StagingBufferPool;
 class ResourcePool;
 
 class CC_EXPORT OneCopyTileTaskWorkerPool : public TileTaskWorkerPool,
-                                            public TileTaskRunner,
                                             public RasterBufferProvider {
  public:
   ~OneCopyTileTaskWorkerPool() override;
@@ -35,9 +33,6 @@ class CC_EXPORT OneCopyTileTaskWorkerPool : public TileTaskWorkerPool,
       ResourceFormat preferred_tile_format);
 
   // Overridden from TileTaskWorkerPool:
-  TileTaskRunner* AsTileTaskRunner() override;
-
-  // Overridden from TileTaskRunner:
   void Shutdown() override;
   void ScheduleTasks(TaskGraph* graph) override;
   void CheckForCompletedTasks() override;