net: Implement canceling of all async operations in FileStream.

content/browser/download/base_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 "content/browser/download/base_file.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/format_macros.h"
 #include "base/logging.h"
@@ skipping 399 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   DCHECK(!detached_);
 
   bound_net_log_.AddEvent(net::NetLog::TYPE_CANCELLED);
 
   Close();
 
   if (!full_path_.empty()) {
     bound_net_log_.AddEvent(net::NetLog::TYPE_DOWNLOAD_FILE_DELETED);
 
-    file_util::Delete(full_path_, false);
+    bool deleted = file_util::Delete(full_path_, false);
+    DCHECK(deleted);
   }
 }
 
 void BaseFile::Finish() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 
   if (calculate_hash_)
     secure_hash_->Finish(sha256_hash_, kSha256HashLen);
 
   Close();
@@ skipping 91 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 
   bound_net_log_.AddEvent(net::NetLog::TYPE_DOWNLOAD_FILE_CLOSED);
 
   if (file_stream_.get()) {
 #if defined(OS_CHROMEOS)
     // Currently we don't really care about the return value, since if it fails
     // theres not much we can do.  But we might in the future.
     file_stream_->FlushSync();
 #endif
-    file_stream_->CloseSync();
     ClearStream(net::OK);
   }
 }
 
 net::Error BaseFile::ClearStream(net::Error net_error) {
   // This should only be called when we have a stream.
   DCHECK(file_stream_.get() != NULL);
   file_stream_.reset();
   bound_net_log_.EndEvent(net::NetLog::TYPE_DOWNLOAD_FILE_OPENED);
   return net_error;
@@ skipping 13 matching lines @@
 int64 BaseFile::CurrentSpeedAtTime(base::TimeTicks current_time) const {
   base::TimeDelta diff = current_time - start_tick_;
   int64 diff_ms = diff.InMilliseconds();
   return diff_ms == 0 ? 0 : bytes_so_far() * 1000 / diff_ms;
 }
 
 int64 BaseFile::CurrentSpeed() const {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   return CurrentSpeedAtTime(base::TimeTicks::Now());
 }