Remove some PlatformFile uses from NaCl.

components/nacl/browser/nacl_process_host.cc

Index: components/nacl/browser/nacl_process_host.cc
diff --git a/components/nacl/browser/nacl_process_host.cc b/components/nacl/browser/nacl_process_host.cc
index a5a1341dcfb16c65a3bcc8baf41eccd24c8c6b65..9c18115949f6ed9e99845ee626ac00cb3e8f6817 100644
--- a/components/nacl/browser/nacl_process_host.cc
+++ b/components/nacl/browser/nacl_process_host.cc
@@ -868,12 +868,11 @@ void NaClProcessHost::OnSetKnownToValidate(const std::string& signature) {
 void NaClProcessHost::FileResolved(
     const base::FilePath& file_path,
     IPC::Message* reply_msg,
-    const base::PlatformFile& file) {
-  if (file != base::kInvalidPlatformFileValue) {
-    IPC::PlatformFileForTransit handle = IPC::GetFileHandleForProcess(
-        file,
-        process_->GetData().handle,
-        true /* close_source */);
+    base::File file) {
+  if (file.IsValid()) {
+    IPC::PlatformFileForTransit handle = IPC::TakeFileHandleForProcess(
+        file.Pass(),
+        process_->GetData().handle);
     NaClProcessMsg_ResolveFileToken::WriteReplyParams(
         reply_msg,
         handle,