repro for crbug.com/663886

base/callback_helpers.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/callback_helpers.h"
 
 #include "base/callback.h"
 
 namespace base {
-
-ScopedClosureRunner::ScopedClosureRunner() {}
-
-ScopedClosureRunner::ScopedClosureRunner(const Closure& closure)
-    : closure_(closure) {}
-
-ScopedClosureRunner::~ScopedClosureRunner() {
-  if (!closure_.is_null())
-    closure_.Run();
-}
-
-ScopedClosureRunner::ScopedClosureRunner(ScopedClosureRunner&& other)
-    : closure_(other.Release()) {}
-
-ScopedClosureRunner& ScopedClosureRunner::operator=(
-    ScopedClosureRunner&& other) {
-  ReplaceClosure(other.Release());
-  return *this;
-}
-
-void ScopedClosureRunner::RunAndReset() {
-  Closure old_closure = Release();
-  if (!old_closure.is_null())
-    old_closure.Run();
-}
-
-void ScopedClosureRunner::ReplaceClosure(const Closure& closure) {
-  closure_ = closure;
-}
-
-Closure ScopedClosureRunner::Release() {
-  Closure result = closure_;
-  closure_.Reset();
-  return result;
-}
-
 }  // namespace base