Revert "Mojo: Add BindingsSupportImpl on top of HandleWatcher"

mojo/common/bindings_support_impl.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 "mojo/common/bindings_support_impl.h"
-
-#include "base/atomic_ref_count.h"
-#include "base/bind.h"
-#include "mojo/common/handle_watcher.h"
-
-namespace mojo {
-namespace common {
-
-// Context is used to track the number of HandleWatcher objects in use by a
-// particular BindingsSupportImpl instance.
-class BindingsSupportImpl::Context
-    : public base::RefCountedThreadSafe<BindingsSupportImpl::Context> {
- public:
-  void CallOnHandleReady(HandleWatcher* watcher,
-                         AsyncWaitCallback* callback,
-                         MojoResult result) {
-    delete watcher;
-    callback->OnHandleReady(result);
-  }
-
- private:
-  friend class base::RefCountedThreadSafe<Context>;
-  virtual ~Context() {}
-};
-
-BindingsSupportImpl::BindingsSupportImpl()
-    : context_(new Context()) {
-}
-
-BindingsSupportImpl::~BindingsSupportImpl() {
-  // All HandleWatcher instances created through this interface should have
-  // been destroyed.
-  DCHECK(context_->HasOneRef());
-}
-
-BindingsSupport::AsyncWaitID BindingsSupportImpl::AsyncWait(
-    Handle handle,
-    MojoWaitFlags flags,
-    AsyncWaitCallback* callback) {
-  // This instance will be deleted when done or cancelled.
-  HandleWatcher* watcher = new HandleWatcher();
-
-  // TODO(darin): Standardize on mojo::Handle instead of MojoHandle?
-  watcher->Start(handle.value,
-                 flags,
-                 MOJO_DEADLINE_INDEFINITE,
-                 base::Bind(&Context::CallOnHandleReady,
-                            context_,
-                            watcher,
-                            callback));
-  return watcher;
-}
-
-void BindingsSupportImpl::CancelWait(AsyncWaitID async_wait_id) {
-  HandleWatcher* watcher = static_cast<HandleWatcher*>(async_wait_id);
-  delete watcher;
-}
-
-}  // namespace common
-}  // namespace mojo