Convert loose FX_Create* functions into static methods

fpdfsdk/fpdfview.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "public/fpdfview.h"
 
 #include <memory>
 #include <utility>
@@ skipping 375 matching lines @@
 DLLEXPORT void STDCALL FPDF_SetPrintTextWithGDI(FPDF_BOOL use_gdi) {
   g_pdfium_print_text_with_gdi = !!use_gdi;
 }
 #endif
 
 DLLEXPORT FPDF_DOCUMENT STDCALL FPDF_LoadDocument(FPDF_STRING file_path,
                                                   FPDF_BYTESTRING password) {
   // NOTE: the creation of the file needs to be by the embedder on the
   // other side of this API.
   IFX_SeekableReadStream* pFileAccess =
-      FX_CreateFileRead((const FX_CHAR*)file_path);
-  if (!pFileAccess) {
+      IFX_SeekableReadStream::CreateFromFilename((const FX_CHAR*)file_path);
+  if (!pFileAccess)
     return nullptr;
-  }
 
-  std::unique_ptr<CPDF_Parser> pParser(new CPDF_Parser);
+  auto pParser = pdfium::MakeUnique<CPDF_Parser>();
   pParser->SetPassword(password);
 
-  std::unique_ptr<CPDF_Document> pDocument(
-      new CPDF_Document(std::move(pParser)));
+  auto pDocument = pdfium::MakeUnique<CPDF_Document>(std::move(pParser));
   CPDF_Parser::Error error =
       pDocument->GetParser()->StartParse(pFileAccess, pDocument.get());
   if (error != CPDF_Parser::SUCCESS) {
     ProcessParseError(error);
     return nullptr;
   }
   return FPDFDocumentFromCPDFDocument(pDocument.release());
 }
 
 #ifdef PDF_ENABLE_XFA
@@ skipping 755 matching lines @@
   if (!buffer) {
     *buflen = len;
   } else if (len <= *buflen) {
     memcpy(buffer, utf16Name.c_str(), len);
     *buflen = len;
   } else {
     *buflen = -1;
   }
   return (FPDF_DEST)pDestObj;
 }