Cleanup: Remove unneeded forward declarations in ppapi.

ppapi/proxy/ppb_cursor_control_proxy.h

 // Copyright (c) 2011 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 PPAPI_PPB_CURSOR_CONTROL_PROXY_H_
-#define PPAPI_PPB_CURSOR_CONTROL_PROXY_H_
+#ifndef PPAPI_PROXY_PPB_CURSOR_CONTROL_PROXY_H_
+#define PPAPI_PROXY_PPB_CURSOR_CONTROL_PROXY_H_
 
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_point.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/shared_impl/function_group_base.h"
 #include "ppapi/shared_impl/host_resource.h"
 #include "ppapi/thunk/ppb_cursor_control_api.h"
 
-struct PPB_CursorControl_Dev;
-
 namespace ppapi {
 namespace proxy {
 
 class PPB_CursorControl_Proxy
     : public InterfaceProxy,
       public ppapi::thunk::PPB_CursorControl_FunctionAPI {
  public:
-  PPB_CursorControl_Proxy(Dispatcher* dispatcher);
+  explicit PPB_CursorControl_Proxy(Dispatcher* dispatcher);
   virtual ~PPB_CursorControl_Proxy();
 
   // FunctionGroupBase overrides.
   ppapi::thunk::PPB_CursorControl_FunctionAPI* AsPPB_CursorControl_FunctionAPI()
       OVERRIDE;
 
   // PPB_CursorControl_FunctionAPI implementation.
   virtual PP_Bool SetCursor(PP_Instance instance,
                             PP_CursorType_Dev type,
                             PP_Resource custom_image_id,
@@ skipping 21 matching lines @@
                          PP_Bool* result);
   void OnMsgHasCursorLock(PP_Instance instance,
                           PP_Bool* result);
   void OnMsgCanLockCursor(PP_Instance instance,
                           PP_Bool* result);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
-#endif  // PPAPI_PPB_CURSOR_CONTROL_PROXY_H_
+#endif  // PPAPI_PROXY_PPB_CURSOR_CONTROL_PROXY_H_