Clean up forward declarations in Source/modules

Source/modules/webmidi/MIDIAccessInitializer.h

 // Copyright 2014 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 MIDIAccessInitializer_h
 #define MIDIAccessInitializer_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "modules/webmidi/MIDIAccessor.h"
 #include "modules/webmidi/MIDIAccessorClient.h"
 #include "modules/webmidi/MIDIPort.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-class MIDIAccess;
 class MIDIOptions;
-class Navigator;
 class ScriptState;
 
 class MIDIAccessInitializer : public ScriptPromiseResolver, public MIDIAccessorClient {
 public:
     struct PortDescriptor {
         String id;
         String manufacturer;
         String name;
         MIDIPort::MIDIPortTypeCode type;
         String version;
@@ skipping 34 matching lines @@
 
     OwnPtr<MIDIAccessor> m_accessor;
     bool m_requestSysex;
     Vector<PortDescriptor> m_portDescriptors;
 };
 
 } // namespace blink
 
 
 #endif // MIDIAccessInitializer_h