Avoid to include IDL-generated headers from EventTarget.h and Node.h

third_party/WebKit/Source/modules/sensor/Sensor.h

 // 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.
 
 #ifndef Sensor_h
 #define Sensor_h
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/DOMHighResTimeStamp.h"
 #include "core/dom/DOMTimeStamp.h"
 #include "core/dom/SuspendableObject.h"
 #include "core/frame/PlatformEventController.h"
 #include "modules/EventTargetModules.h"
 #include "modules/sensor/SensorOptions.h"
 #include "modules/sensor/SensorProxy.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
+class DOMException;
 class ExceptionState;
 class ExecutionContext;
 class SensorReading;
 
 class Sensor : public EventTargetWithInlineData,
                public ActiveScriptWrappable<Sensor>,
                public ContextLifecycleObserver,
                public SensorProxy::Observer {
   USING_GARBAGE_COLLECTED_MIXIN(Sensor);
   DEFINE_WRAPPERTYPEINFO();
@@ skipping 78 matching lines @@
   SensorState m_state;
   Member<SensorProxy> m_sensorProxy;
   device::SensorReading m_storedData;
   SensorConfigurationPtr m_configuration;
   double m_lastUpdateTimestamp;
 };
 
 }  // namespace blink
 
 #endif  // Sensor_h