Remove PlatformFile from ppapi

ppapi/proxy/proxy_channel.cc

Index: ppapi/proxy/proxy_channel.cc
diff --git a/ppapi/proxy/proxy_channel.cc b/ppapi/proxy/proxy_channel.cc
index b7f8a826ce3245bfbf40d203f642b3f58d64514e..c1f48de6b4298296fb4bc8bd5acfa9cc96b8a3d9 100644
--- a/ppapi/proxy/proxy_channel.cc
+++ b/ppapi/proxy/proxy_channel.cc
@@ -64,11 +64,7 @@ IPC::PlatformFileForTransit ProxyChannel::ShareHandleWithRemote(
   // Channel could be closed if the plugin crashes.
   if (!channel_.get()) {
     if (should_close_source) {
-#if !defined(OS_NACL)
-      base::ClosePlatformFile(handle);
-#else
-      close(handle);
-#endif
+      base::File file_closer(handle);
     }
     return IPC::InvalidPlatformFileForTransit();
   }