Revert "Add an IPC for PNaCl to check if the session is incognito,"

ppapi/native_client/src/trusted/plugin/temporary_file.cc

Index: ppapi/native_client/src/trusted/plugin/temporary_file.cc
diff --git a/ppapi/native_client/src/trusted/plugin/temporary_file.cc b/ppapi/native_client/src/trusted/plugin/temporary_file.cc
index 7e84c47eb1d47b750635e9d15826bf90525760ff..4cdd04daee3558d5c978891ebda5bb02b889b497 100644
--- a/ppapi/native_client/src/trusted/plugin/temporary_file.cc
+++ b/ppapi/native_client/src/trusted/plugin/temporary_file.cc
@@ -69,31 +69,16 @@ void TempFile::Open(const pp::CompletionCallback& cb) {
     return;
   }
 
-  // dup the fd to make allow making a non-Quota-based wrapper.
-  // sel_ldr currently does not allow loading from Quota-backed descs,
-  // only plain host descs.  It's probably good hygiene to separate the
-  // read wrapper from the write wrapper anyway.
-  int32_t read_fd = DUP(fd);
-  if (read_fd == NACL_NO_FILE_DESC) {
-    PLUGIN_PRINTF(("TempFile::Open DUP failed\n"));
-    core->CallOnMainThread(0, cb, PP_ERROR_FAILED);
-    return;
-  }
-
   // The descriptor for a writeable file needs to have quota management.
-  write_wrapper_.reset(
-      plugin_->wrapper_factory()->MakeFileDescQuota(fd, O_RDWR, identifier_));
-  read_wrapper_.reset(
-      plugin_->wrapper_factory()->MakeFileDesc(fd, O_RDONLY));
+  wrapper_.reset(
+    plugin_->wrapper_factory()->MakeFileDescQuota(fd, O_RDWR, identifier_));
   core->CallOnMainThread(0, cb, PP_OK);
 }
 
 bool TempFile::Reset() {
   PLUGIN_PRINTF(("TempFile::Reset\n"));
-  // Use the write_wrapper_ to reset the file pos.  The read_wrapper_ is also
-  // backed by the same file, so it should also reset.
-  CHECK(write_wrapper_.get() != NULL);
-  nacl_off64_t newpos = write_wrapper_->Seek(0, SEEK_SET);
+  CHECK(wrapper_.get() != NULL);
+  nacl_off64_t newpos = wrapper_->Seek(0, SEEK_SET);
   return newpos >= 0;
 }