Cleanup PDF plugin code.

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"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
+#include <memory>
 #include <string>
 #include <vector>
 
 #include "base/strings/string16.h"
 
 #include "ppapi/c/dev/pp_cursor_type_dev.h"
 #include "ppapi/c/dev/ppp_printing_dev.h"
 #include "ppapi/c/ppb_input_event.h"
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/image_data.h"
@@ skipping 156 matching lines @@
     virtual bool IsPrintPreview() = 0;
 
     // Get the background color of the PDF.
     virtual uint32_t GetBackgroundColor() = 0;
 
     // Sets selection status.
     virtual void IsSelectingChanged(bool is_selecting) {}
   };
 
   // Factory method to create an instance of the PDF Engine.
-  static PDFEngine* Create(Client* client);
+  static std::unique_ptr<PDFEngine> Create(Client* client);
 
   virtual ~PDFEngine() {}
 
   // Most of these functions are similar to the Pepper functions of the same
   // name, so not repeating the description here unless it's different.
   virtual bool New(const char* url, const char* headers) = 0;
   virtual void PageOffsetUpdated(const pp::Point& page_offset) = 0;
   virtual void PluginSizeUpdated(const pp::Size& size) = 0;
   virtual void ScrolledToXPosition(int position) = 0;
   virtual void ScrolledToYPosition(int position) = 0;
@@ skipping 158 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_