Enable size_t to int truncation warnings in PPAPI

ppapi/tests/test_flash_file.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 "ppapi/tests/test_flash_file.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ppapi/c/pp_file_info.h"
@@ skipping 18 matching lines @@
 #if defined(PPAPI_OS_WIN)
   CloseHandle(file_handle);
 #else
   close(file_handle);
 #endif
 }
 
 bool WriteFile(PP_FileHandle file_handle, const std::string& contents) {
 #if defined(PPAPI_OS_WIN)
   DWORD bytes_written = 0;
-  BOOL result = ::WriteFile(file_handle, contents.c_str(), contents.size(),
+  BOOL result = ::WriteFile(file_handle, contents.c_str(),
+                            static_cast<DWORD>(contents.size()),
                             &bytes_written, NULL);
   return result && bytes_written == static_cast<DWORD>(contents.size());
 #else
   ssize_t bytes_written = 0;
   do {
     bytes_written = write(file_handle, contents.c_str(), contents.size());
   } while (bytes_written == -1 && errno == EINTR);
   return bytes_written == static_cast<ssize_t>(contents.size());
 #endif
 }
@@ skipping 275 matching lines @@
 }
 
 std::string TestFlashFile::GetItemCountUnderModuleLocalRoot(
     size_t* item_count) {
   std::vector<FileModuleLocal::DirEntry> contents;
   ASSERT_TRUE(
       FileModuleLocal::GetDirContents(instance_, std::string(), &contents));
   *item_count = contents.size();
   PASS();
 }