content: Cleanup class/struct forward declarations

content/renderer/pepper/event_conversion.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_PEPPER_EVENT_CONVERSION_H_
 #define CONTENT_RENDERER_PEPPER_EVENT_CONVERSION_H_
 
 #include <memory>
 #include <vector>
 
 #include "content/common/content_export.h"
 #include "ppapi/c/ppb_input_event.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 struct PP_InputEvent;
 
 namespace ppapi {
 struct InputEventData;
 }
 
 namespace blink {
-class WebGamepads;
 class WebInputEvent;
 }
 
 namespace content {
 
 // Converts the given WebKit event to one or possibly multiple PP_InputEvents.
 // The generated events will be filled into the given vector. On failure, no
 // events will ge generated and the vector will be empty.
 CONTENT_EXPORT void CreateInputEventData(
     const blink::WebInputEvent& event,
@@ skipping 12 matching lines @@
                               int plugin_x,
                               int plugin_y);
 
 // Returns the PPAPI event class for the given WebKit event type. The given
 // type should not be "Undefined" since there's no corresponding PPAPI class.
 PP_InputEvent_Class ClassifyInputEvent(const blink::WebInputEvent& event);
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_EVENT_CONVERSION_H_