PDF: Consistently pass FPDF handles by value.

pdf/pdfium/fuzzers/pdfium_fuzzer_helper.cc

 // Copyright 2017 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.
 
 // This fuzzer is simplified & cleaned up pdfium/samples/pdfium_test.cc
 
 #include "pdf/pdfium/fuzzers/pdfium_fuzzer_helper.h"
 
 #include <assert.h>
 #include <limits.h>
@@ skipping 174 matching lines @@
         nRet = FPDFAvail_IsPageAvail(pdf_avail.get(), i, &hints);
 
       if (nRet == PDF_DATA_ERROR)
         return;
     }
     RenderPage(doc.get(), form.get(), i);
   }
   FORM_DoDocumentAAction(form.get(), FPDFDOC_AACTION_WC);
 }
 
-bool PDFiumFuzzerHelper::RenderPage(const FPDF_DOCUMENT& doc,
-                                    const FPDF_FORMHANDLE& form,
+bool PDFiumFuzzerHelper::RenderPage(FPDF_DOCUMENT doc,
+                                    FPDF_FORMHANDLE form,
                                     const int page_index) {
   std::unique_ptr<void, FPDFPageDeleter> page(FPDF_LoadPage(doc, page_index));
   if (!page)
     return false;
 
   std::unique_ptr<void, FPDFTextPageDeleter> text_page(
       FPDFText_LoadPage(page.get()));
   FORM_OnAfterLoadPage(page.get(), form);
   FORM_DoPageAAction(page.get(), form, FPDFPAGE_AACTION_OPEN);
 
@@ skipping 35 matching lines @@
     FSDK_SetUnSpObjProcessHandler(&unsupport_info);
   }
 
   v8::Platform* platform;
   v8::StartupData natives_blob;
   v8::StartupData snapshot_blob;
   FPDF_LIBRARY_CONFIG config;
   UNSUPPORT_INFO unsupport_info;
 };
 static TestCase* testCase = new TestCase();