cc: Remove ScheduleOnOriginThread() and CompleteOnOriginThread().

cc/tiles/tile_manager_unittest.cc

Index: cc/tiles/tile_manager_unittest.cc
diff --git a/cc/tiles/tile_manager_unittest.cc b/cc/tiles/tile_manager_unittest.cc
index 18cdcb834bf49190ebd4d9204ddcb76a66fbc7ee..fd5745ac98bb8f7f410a7241ae18c78a86d30fdf 100644
--- a/cc/tiles/tile_manager_unittest.cc
+++ b/cc/tiles/tile_manager_unittest.cc
@@ -1908,22 +1908,7 @@ TEST_F(ActivationTasksDoNotBlockReadyToDrawTest,
   run_loop.Run();
 }
 
-// Fake TileTaskManager that just cancels all scheduled tasks immediately.
-class CancellingTileTaskManager : public FakeTileTaskManagerImpl {
- public:
-  CancellingTileTaskManager() {}
-  ~CancellingTileTaskManager() override {}
-
-  void ScheduleTasks(TaskGraph* graph) override {
-    // Just call CompleteOnOriginThread on each item in the queue. As none of
-    // these items have run yet, they will be treated as cancelled tasks.
-    for (const auto& node : graph->nodes) {
-      static_cast<TileTask*>(node.task)->CompleteOnOriginThread(
-          raster_buffer_provider_.get());
-    }
-  }
-  void CheckForCompletedTasks() override {}
-};
+using CancellingTileTaskManager = FakeTileTaskManagerImpl;
 
 class PartialRasterTileManagerTest : public TileManagerTest {
  public:
@@ -2017,17 +2002,6 @@ class VerifyResourceContentIdTileTaskManager : public FakeTileTaskManagerImpl {
             new VerifyResourceContentIdRasterBufferProvider(
                 expected_resource_id))) {}
   ~VerifyResourceContentIdTileTaskManager() override {}
-
-  void ScheduleTasks(TaskGraph* graph) override {
-    for (const auto& node : graph->nodes) {
-      TileTask* task = static_cast<TileTask*>(node.task);
-      // Triggers a call to AcquireBufferForRaster.
-      task->ScheduleOnOriginThread(raster_buffer_provider_.get());
-      // Calls TileManager as though task was cancelled.
-      task->CompleteOnOriginThread(raster_buffer_provider_.get());
-    }
-  }
-  void CheckForCompletedTasks() override {}
 };
 
 // Runs a test to ensure that partial raster is either enabled or disabled,