Make Callback::Reset() return a copy to support use-cases where Run() ends up modifying |*this|.

media/base/filters.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 "media/base/filters.h"
 
 #include "base/logging.h"
 
 namespace media {
 
-void ResetAndRunCB(PipelineStatusCB* cb, PipelineStatus status) {
-  DCHECK(!cb->is_null());
-  PipelineStatusCB tmp_cb(*cb);
-  cb->Reset();
-  tmp_cb.Run(status);
-}
-
-void ResetAndRunCB(base::Closure* cb) {
-  DCHECK(!cb->is_null());
-  base::Closure tmp_cb(*cb);
-  cb->Reset();
-  tmp_cb.Run();
-}
-
 Filter::Filter() : host_(NULL) {}
 
 Filter::~Filter() {}
 
 void Filter::clear_host() {
   DCHECK(host_);
   host_ = NULL;
 }
 
 void Filter::set_host(FilterHost* host) {
@@ skipping 53 matching lines @@
   LOG(FATAL) << "VideoDecoder::Seek is not supposed to be called.";
 }
 
 bool VideoDecoder::HasAlpha() const {
   return false;
 }
 
 void VideoDecoder::PrepareForShutdownHack() {}
 
 }  // namespace media