Cleanup remaining class/struct fwd declarations

pdf/pdf_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_PDF_ENGINE_H_
 #define PDF_PDF_ENGINE_H_
 
 #include <stdint.h>
 
 #include "build/build_config.h"
@@ skipping 24 matching lines @@
                                                       size_t text_length);
 #endif
 
 namespace pp {
 class InputEvent;
 class VarDictionary;
 }
 
 namespace chrome_pdf {
 
-class Stream;
-
 // Do one time initialization of the SDK.
 bool InitializeSDK();
 // Tells the SDK that we're shutting down.
 void ShutdownSDK();
 
 // This class encapsulates a PDF rendering engine.
 class PDFEngine {
  public:
   enum DocumentPermission {
     PERMISSION_COPY,
@@ skipping 305 matching lines @@
   virtual bool GetPDFPageSizeByIndex(const void* pdf_buffer,
                                      int pdf_buffer_size,
                                      int page_number,
                                      double* width,
                                      double* height) = 0;
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_PDF_ENGINE_H_