Revert of Straightens outs DEPS in mojo/common

mojo/message_pump/handle_watcher.h

-// 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.
-
-#ifndef MOJO_MESSAGE_PUMP_HANDLE_WATCHER_H_
-#define MOJO_MESSAGE_PUMP_HANDLE_WATCHER_H_
-
-#include "base/basictypes.h"
-#include "base/callback_forward.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/run_loop.h"
-#include "third_party/mojo/src/mojo/public/cpp/system/core.h"
-
-namespace base {
-class Thread;
-}
-
-namespace mojo {
-namespace common {
-namespace test {
-class HandleWatcherTest;
-}
-
-// HandleWatcher is used to asynchronously wait on a handle and notify a Closure
-// when the handle is ready, or the deadline has expired.
-class HandleWatcher {
- public:
-  HandleWatcher();
-
-  // The destructor implicitly stops listening. See Stop() for details.
-  ~HandleWatcher();
-
-  // Starts listening for |handle|. This implicitly invokes Stop(). In other
-  // words, Start() performs one asynchronous watch at a time. It is ok to call
-  // Start() multiple times, but it cancels any existing watches. |callback| is
-  // notified when the handle is ready, invalid or deadline has passed and is
-  // notified on the thread Start() was invoked on. If the current thread exits
-  // before the handle is ready, then |callback| is invoked with a result of
-  // MOJO_RESULT_ABORTED.
-  void Start(const Handle& handle,
-             MojoHandleSignals handle_signals,
-             MojoDeadline deadline,
-             const base::Callback<void(MojoResult)>& callback);
-
-  // Stops listening. Does nothing if not in the process of listening. Blocks
-  // until no longer listening on the handle.
-  void Stop();
-
- private:
-  class StateBase;
-  class SameThreadWatchingState;
-  class SecondaryThreadWatchingState;
-
-  // If non-NULL Start() has been invoked.
-  scoped_ptr<StateBase> state_;
-
-  DISALLOW_COPY_AND_ASSIGN(HandleWatcher);
-};
-
-}  // namespace common
-}  // namespace mojo
-
-#endif  // MOJO_MESSAGE_PUMP_HANDLE_WATCHER_H_