Use ByteStream in downloads system to decouple source and sink.

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/file_util.h"
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/pickle.h"
@@ skipping 254 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   DCHECK(!detached_);
 
   // NOTE(benwells): The above DCHECK won't be present in release builds,
   // so we log any occurences to see how common this error is in the wild.
   if (detached_) {
     download_stats::RecordDownloadCount(
         download_stats::APPEND_TO_DETACHED_FILE_COUNT);
   }
 
-  if (bound_net_log_.IsLoggingAllEvents()) {
-    bound_net_log_.AddEvent(
-        net::NetLog::TYPE_DOWNLOAD_FILE_WRITTEN,
-        make_scoped_refptr(new net::NetLogIntegerParameter(
-            "byte_count", data_len)));
-  }
-
   if (!file_stream_.get())
     return LOG_ERROR("get", net::ERR_INVALID_HANDLE);
 
   // TODO(phajdan.jr): get rid of this check.
   if (data_len == 0)
     return net::OK;
 
   // The Write call below is not guaranteed to write all the data.
   size_t write_count = 0;
   size_t len = data_len;
@@ skipping 269 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());
 }