Cleanup PDF plugin code.

pdf/pdfium/pdfium_engine.cc

 // 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.
 
 #include "pdf/pdfium/pdfium_engine.h"
 
 #include <math.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 641 matching lines @@
 }
 
 void ShutdownSDK() {
   FPDF_DestroyLibrary();
 #if !defined(OS_LINUX)
   delete g_font_info;
 #endif
   TearDownV8();
 }
 
-PDFEngine* PDFEngine::Create(PDFEngine::Client* client) {
-  return new PDFiumEngine(client);
+std::unique_ptr<PDFEngine> PDFEngine::Create(PDFEngine::Client* client) {
+  return base::MakeUnique<PDFiumEngine>(client);
 }
 
 PDFiumEngine::PDFiumEngine(PDFEngine::Client* client)
     : client_(client),
       current_zoom_(1.0),
       current_rotation_(0),
       doc_loader_(this),
       password_tries_remaining_(0),
       doc_(nullptr),
       form_(nullptr),
@@ skipping 3445 matching lines @@
   FPDF_DOCUMENT doc =
       FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, nullptr);
   if (!doc)
     return false;
   bool success = FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;
   FPDF_CloseDocument(doc);
   return success;
 }
 
 }  // namespace chrome_pdf