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diff --git a/third_party/mojo/src/mojo/edk/system/simple_dispatcher.h b/third_party/mojo/src/mojo/edk/system/simple_dispatcher.h
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--- a/third_party/mojo/src/mojo/edk/system/simple_dispatcher.h
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@@ -1,49 +0,0 @@
-// 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 THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_SIMPLE_DISPATCHER_H_
-#define THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_SIMPLE_DISPATCHER_H_
-
-#include <list>
-
-#include "mojo/public/cpp/system/macros.h"
-#include "third_party/mojo/src/mojo/edk/system/awakable_list.h"
-#include "third_party/mojo/src/mojo/edk/system/dispatcher.h"
-#include "third_party/mojo/src/mojo/edk/system/system_impl_export.h"
-
-namespace mojo {
-namespace system {
-
-// A base class for simple dispatchers. "Simple" means that there's a one-to-one
-// correspondence between handles and dispatchers (see the explanatory comment
-// in core.cc). This class implements the standard waiter-signalling mechanism
-// in that case.
-class MOJO_SYSTEM_IMPL_EXPORT SimpleDispatcher : public Dispatcher {
- protected:
- SimpleDispatcher();
- ~SimpleDispatcher() override;
-
- // To be called by subclasses when the state changes (so
- // |GetHandleSignalsStateImplNoLock()| should be checked again).
- void HandleSignalsStateChangedNoLock() MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex());
-
- // |Dispatcher| protected methods:
- void CancelAllAwakablesNoLock() override;
- MojoResult AddAwakableImplNoLock(Awakable* awakable,
- MojoHandleSignals signals,
- uintptr_t context,
- HandleSignalsState* signals_state) override;
- void RemoveAwakableImplNoLock(Awakable* awakable,
- HandleSignalsState* signals_state) override;
-
- private:
- AwakableList awakable_list_ MOJO_GUARDED_BY(mutex());
-
- MOJO_DISALLOW_COPY_AND_ASSIGN(SimpleDispatcher);
-};
-
-} // namespace system
-} // namespace mojo
-
-#endif // THIRD_PARTY_MOJO_SRC_MOJO_EDK_SYSTEM_SIMPLE_DISPATCHER_H_