Remove some PlatformFile instances from ChromeOS Drive.

net/base/file_stream_context.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 "net/base/file_stream_context.h"
 
 #include "base/location.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/task_runner_util.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 256 matching lines @@
     file_ = open_result.file.Pass();
     OnAsyncFileOpened();
   }
   OnAsyncCompleted(IntToInt64(callback), open_result.error_code.result);
 }
 
 void FileStream::Context::CloseAndDelete() {
   DCHECK(!async_in_progress_);
 
   if (file_.IsValid()) {
-    bool posted = task_runner_.get()->PostTaskAndReply(
+    bool posted = task_runner_.get()->PostTask(
         FROM_HERE,
         base::Bind(base::IgnoreResult(&Context::CloseFileImpl),
-                   base::Unretained(this)),
-        base::Bind(&Context::OnCloseCompleted, base::Unretained(this)));
+                   base::Owned(this)));
     DCHECK(posted);
   } else {
     delete this;
   }
 }
 
-void FileStream::Context::OnCloseCompleted() {
-  delete this;
-}
-
 Int64CompletionCallback FileStream::Context::IntToInt64(
     const CompletionCallback& callback) {
   return base::Bind(&CallInt64ToInt, callback);
 }
 
 void FileStream::Context::ProcessAsyncResult(
     const Int64CompletionCallback& callback,
     FileErrorSource source,
     const IOResult& result) {
   RecordError(result, source);
   OnAsyncCompleted(callback, result.result);
 }
 
 void FileStream::Context::OnAsyncCompleted(
     const Int64CompletionCallback& callback,
     int64 result) {
   // Reset this before Run() as Run() may issue a new async operation. Also it
   // should be reset before CloseAsync() because it shouldn't run if any async
   // operation is in progress.
   async_in_progress_ = false;
   if (orphaned_)
     CloseAndDelete();
   else
     callback.Run(result);
 }
 
 }  // namespace net