Move BindToCurrentLoop from media/base/ to base/

base/bind_to_current_loop.h

 // Copyright (c) 2015 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.
 
-#ifndef MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_
-#define MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_
+#ifndef BASE_BIND_TO_CURRENT_LOOP_H_
+#define BASE_BIND_TO_CURRENT_LOOP_H_
 
 #include "base/bind.h"
 #include "base/location.h"
-#include "base/message_loop/message_loop_proxy.h"
+#include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 
 // This is a helper utility for base::Bind()ing callbacks to the current
 // MessageLoop. The typical use is when |a| (of class |A|) wants to hand a
 // callback such as base::Bind(&A::AMethod, a) to |b|, but needs to ensure that
 // when |b| executes the callback, it does so on |a|'s current MessageLoop.
 //
 // Typical usage: request to be called back on the current thread:
 // other->StartAsyncProcessAndCallMeBack(
-//    media::BindToCurrentLoop(base::Bind(&MyClass::MyMethod, this)));
+//     base::BindToCurrentLoop(base::Bind(&MyClass::MyMethod, this)));
 //
-// Note that like base::Bind(), BindToCurrentLoop() can't bind non-constant
-// references, and that *unlike* base::Bind(), BindToCurrentLoop() makes copies
-// of its arguments, and thus can't be used with arrays.
+// Note that like base::Bind(), base::BindToCurrentLoop() can't bind
+// non-constant references, and that *unlike* base::Bind(),
+// base::BindToCurrentLoop() makes copies of its arguments, and thus can't be
+// used with arrays.
 
-namespace media {
+namespace base {
+
+namespace internal {
 
 // Mimic base::internal::CallbackForward, replacing p.Pass() with
 // base::Passed(&p) to account for the extra layer of indirection.
-namespace internal {
 template <typename T>
 T& TrampolineForward(T& t) { return t; }
 
 template <typename T, typename R>
-base::internal::PassedWrapper<scoped_ptr<T, R> > TrampolineForward(
-    scoped_ptr<T, R>& p) { return base::Passed(&p); }
+PassedWrapper<scoped_ptr<T, R> > TrampolineForward(scoped_ptr<T, R>& p) {
+  return Passed(&p);
+}
 
 template <typename T>
-base::internal::PassedWrapper<ScopedVector<T> > TrampolineForward(
-    ScopedVector<T>& p) { return base::Passed(&p); }
+PassedWrapper<ScopedVector<T> > TrampolineForward(ScopedVector<T>& p) {
+  return Passed(&p);
+}
 
 // First, tell the compiler TrampolineHelper is a struct template with one
 // type parameter.  Then define specializations where the type is a function
 // returning void and taking zero or more arguments.
 template <typename Sig> struct TrampolineHelper;
 
 template <typename... Args>
 struct TrampolineHelper<void(Args...)> {
-  static void Run(
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
-      const base::Callback<void(Args...)>& cb,
-      Args... args) {
+  static void Run(const scoped_refptr<SingleThreadTaskRunner>& task_runner,
+                  const Callback<void(Args...)>& cb,
+                  Args... args) {
     task_runner->PostTask(FROM_HERE,
-                          base::Bind(cb, TrampolineForward(args)...));
+                          Bind(cb, TrampolineForward(args)...));
   }
 };
 
 }  // namespace internal
 
 template<typename T>
-static base::Callback<T> BindToCurrentLoop(
-    const base::Callback<T>& cb) {
-  return base::Bind(&internal::TrampolineHelper<T>::Run,
-                    base::MessageLoopProxy::current(), cb);
+static Callback<T> BindToCurrentLoop(const Callback<T>& cb) {
+  return Bind(&internal::TrampolineHelper<T>::Run,
+              MessageLoop::current()->task_runner(), cb);
 }
 
-}  // namespace media
+}  // namespace base
 
-#endif  // MEDIA_BASE_BIND_TO_CURRENT_LOOP_H_
+#endif  // BASE_BIND_TO_CURRENT_LOOP_H_