Move more code from headers to implementation.

media/base/filter_collection.cc

 // Copyright (c) 2010 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/filter_collection.h"
 
 namespace media {
 
-FilterCollection::FilterCollection() {
-}
+FilterCollection::FilterCollection() {}
+
+FilterCollection::~FilterCollection() {}
 
 void FilterCollection::AddDataSource(DataSource* filter) {
   AddFilter(DATA_SOURCE, filter);
 }
 
 void FilterCollection::AddDemuxer(Demuxer* filter) {
   AddFilter(DEMUXER, filter);
 }
 
 void FilterCollection::AddVideoDecoder(VideoDecoder* filter) {
@@ skipping 72 matching lines @@
     ++it;
   }
 
   if (it != filters_.end()) {
     *filter_out = it->second.get();
     filters_.erase(it);
   }
 }
 
 }  // namespace media