Split a portion of BufferedResourceLoader into a separate class ActiveLoader.

webkit/media/webkit_media.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'webkit_media',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/media/media.gyp:yuv_convert',
         '<(DEPTH)/skia/skia.gyp:skia',
       ],
       'sources': [
+        'active_loader.cc',
+        'active_loader.h',
         'audio_decoder.cc',
         'audio_decoder.h',
         'buffered_data_source.cc',
         'buffered_data_source.h',
         'buffered_resource_loader.cc',
         'buffered_resource_loader.h',
         'media_stream_client.h',
         'simple_data_source.cc',
         'simple_data_source.h',
         'video_renderer_impl.cc',
@@ skipping 13 matching lines @@
       'conditions': [
         ['inside_chromium_build==0', {
           'dependencies': [
             '<(DEPTH)/webkit/support/setup_third_party.gyp:third_party_headers',
           ],
         }],
       ],
     },
   ],
 }