Revert of Make canceling Timers fast.

third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.cc

Index: third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.cc b/third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.cc
index ca810dd885da699d5f95bf62d198d836bc44dee7..0c654ee77e942a618665fac72a4d39af8ac30af4 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.cc
@@ -23,6 +23,24 @@
 
   bool RunsTasksOnCurrentThread() const override {
     return task_runner_->RunsTasksOnCurrentThread();
+  }
+
+  TaskQueue::TaskHandle PostCancellableDelayedTask(
+      const tracked_objects::Location& from_here,
+      const base::Closure& task,
+      base::TimeDelta delay) {
+    NOTREACHED();
+    return TaskHandle();
+  }
+
+  bool CancelTask(const TaskQueue::TaskHandle& handle) {
+    NOTREACHED();
+    return false;
+  }
+
+  bool IsTaskPending(const TaskQueue::TaskHandle& handle) const {
+    NOTREACHED();
+    return false;
   }
 
   bool PostDelayedTask(const tracked_objects::Location& from_here,