cc: Eliminate tile.h's dependency on tile_manager.h

cc/resources/raster_worker_pool.cc

Index: cc/resources/raster_worker_pool.cc
diff --git a/cc/resources/raster_worker_pool.cc b/cc/resources/raster_worker_pool.cc
index 5f356e5b2122a304eb8eda800af5fd09e0914d3d..c6654557f8750a17b68085ddaed9698b81478a8f 100644
--- a/cc/resources/raster_worker_pool.cc
+++ b/cc/resources/raster_worker_pool.cc
@@ -269,16 +269,6 @@ bool RasterWorkerPoolTask::HasCompleted() const {
 
 }  // namespace internal
 
-scoped_ptr<base::Value> RasterTaskMetadata::AsValue() const {
-  scoped_ptr<base::DictionaryValue> res(new base::DictionaryValue());
-  res->Set("tile_id", TracedValue::CreateIDRef(tile_id).release());
-  res->SetBoolean("is_tile_in_pending_tree_now_bin",
-                  is_tile_in_pending_tree_now_bin);
-  res->Set("resolution", TileResolutionAsValue(tile_resolution).release());
-  res->SetInteger("source_frame_number", source_frame_number);
-  return res.PassAs<base::Value>();
-}
-
 RasterWorkerPool::Task::Set::Set() {
 }