Fix compile on mac: format string mismatch error.

samples/pdfium_test.cc

 // Copyright (c) 2010 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 <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include <list>
@@ skipping 341 matching lines @@
     FORM_OnBeforeClosePage(page, form);
     FPDFText_ClosePage(text_page);
     FPDF_ClosePage(page);
   }
 
   FORM_DoDocumentAAction(form, FPDFDOC_AACTION_WC);
   FPDFDOC_ExitFormFillEnviroument(form);
   FPDF_CloseDocument(doc);
   FPDFAvail_Destroy(pdf_avail);
 
-  printf("Loaded, parsed and rendered %d pages.\n", rendered_pages);
-  printf("Skipped %d bad pages.\n", bad_pages);
+  printf("Loaded, parsed and rendered %zu pages.\n", rendered_pages);
+  printf("Skipped %zu bad pages.\n", bad_pages);
 }
 
 int main(int argc, const char* argv[]) {
   v8::V8::InitializeICU();
   OutputFormat format = OUTPUT_NONE;
   std::list<const char*> files;
   if (!ParseCommandLine(argc, argv, &format, &files)) {
     printf("Usage: pdfium_test [OPTION] [FILE]...\n");
     printf("--ppm    write page images <pdf-name>.<page-number>.ppm\n");
 #ifdef _WIN32
@@ skipping 31 matching lines @@
     } else {
       RenderPdf(filename, pBuf, len, format);
     }
     free(pBuf);
   }
 
   FPDF_DestroyLibrary();
 
   return 0;
 }