Fix v8 external snapshot code for Windows.

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 87 matching lines @@
 static bool GetExternalData(const Options& options,
                             const std::string& bin_filename,
                             v8::StartupData* result_data) {
   std::string full_path = GetFullPathForSnapshotFile(options, bin_filename);
   size_t data_length = 0;
   char* data_buffer = GetFileContents(full_path.c_str(), &data_length);
   if (!data_buffer) {
     return false;
   }
   result_data->data = const_cast<const char*>(data_buffer);
-  result_data->raw_size = data_length;
+  result_data->raw_size = static_cast<int>(data_length);
   return true;
 }
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 
 static void WritePpm(const char* pdf_name, int num, const void* buffer_void,
                      int stride, int width, int height) {
   const char* buffer = reinterpret_cast<const char*>(buffer_void);
 
   if (stride < 0 || width < 0 || height < 0)
     return;
@@ skipping 391 matching lines @@
     if (!file_contents)
       continue;
     RenderPdf(filename, file_contents, file_length, options.output_format);
     free(file_contents);
   }
 
   FPDF_DestroyLibrary();
 
   return 0;
 }