base::Bind: Remove CancelableTask and ScopedTaskRunner.

base/task.cc

Index: base/task.cc
diff --git a/base/task.cc b/base/task.cc
index 89d2aa80e7fbb599113e6d6efd4fe5feb9e310ae..38ac08660baed3bca9b1d2071b8bef02b85af73f 100644
--- a/base/task.cc
+++ b/base/task.cc
@@ -10,30 +10,8 @@ Task::Task() {
 Task::~Task() {
 }
 
-CancelableTask::CancelableTask() {
-}
-
-CancelableTask::~CancelableTask() {
-}
-
 namespace base {
 
-ScopedTaskRunner::ScopedTaskRunner(Task* task) : task_(task) {
-}
-
-ScopedTaskRunner::~ScopedTaskRunner() {
-  if (task_) {
-    task_->Run();
-    delete task_;
-  }
-}
-
-Task* ScopedTaskRunner::Release() {
-  Task* tmp = task_;
-  task_ = NULL;
-  return tmp;
-}
-
 ScopedClosureRunner::ScopedClosureRunner(const Closure& closure)
     : closure_(closure) {
 }