Flatten interface_binder.h and callback_binder.h

services/service_manager/public/cpp/lib/callback_binder.cc

-// Copyright 2016 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 "services/service_manager/public/cpp/lib/callback_binder.h"
-
-namespace service_manager {
-namespace internal {
-
-GenericCallbackBinder::GenericCallbackBinder(
-    const BindCallback& callback,
-    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
-    : callback_(callback), task_runner_(task_runner) {}
-
-GenericCallbackBinder::~GenericCallbackBinder() {}
-
-void GenericCallbackBinder::BindInterface(
-    const BindSourceInfo& source_info,
-    const std::string& interface_name,
-    mojo::ScopedMessagePipeHandle handle) {
-  if (task_runner_) {
-    task_runner_->PostTask(
-        FROM_HERE, base::Bind(&GenericCallbackBinder::RunCallback, callback_,
-                              base::Passed(&handle)));
-    return;
-  }
-  RunCallback(callback_, std::move(handle));
-}
-
-// static
-void GenericCallbackBinder::RunCallback(const BindCallback& callback,
-                                        mojo::ScopedMessagePipeHandle handle) {
-  callback.Run(std::move(handle));
-}
-
-}  // namespace internal
-}  // namespace service_manager