Cleanup remaining class/struct fwd declarations

pdf/pdfium/pdfium_engine.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 PDF_PDFIUM_PDFIUM_ENGINE_H_
 #define PDF_PDFIUM_PDFIUM_ENGINE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 16 matching lines @@
 #include "ppapi/cpp/point.h"
 #include "ppapi/cpp/var_array.h"
 #include "third_party/pdfium/public/fpdf_dataavail.h"
 #include "third_party/pdfium/public/fpdf_formfill.h"
 #include "third_party/pdfium/public/fpdf_progressive.h"
 #include "third_party/pdfium/public/fpdfview.h"
 
 namespace pp {
 class KeyboardInputEvent;
 class MouseInputEvent;
-class VarDictionary;
 }
 
 namespace chrome_pdf {
 
 class ShadowMatrix;
 
 class PDFiumEngine : public PDFEngine,
                      public DocumentLoader::Client,
                      public FPDF_FORMFILLINFO,
                      public IPDF_JSPLATFORM,
@@ skipping 745 matching lines @@
   bool GetPDFPageSizeByIndex(const void* pdf_buffer,
                              int pdf_buffer_size,
                              int page_number,
                              double* width,
                              double* height) override;
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_PDFIUM_PDFIUM_ENGINE_H_