Move DataSource::SetPreload() to BufferedDataSource.

webkit/media/webkit_media.gypi

 # 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.
 
 {
   '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',
         'audio_decoder_android.cc',
         'buffered_data_source.cc',
         'buffered_data_source.h',
         'buffered_resource_loader.cc',
         'buffered_resource_loader.h',
         'filter_helpers.cc',
         'filter_helpers.h',
         'media_stream_client.h',
+        'preload.h',
         'skcanvas_video_renderer.cc',
         'skcanvas_video_renderer.h',
         'webmediaplayer_delegate.h',
         'webmediaplayer_impl.cc',
         'webmediaplayer_impl.h',
         'webmediaplayer_proxy.cc',
         'webmediaplayer_proxy.h',
         'webvideoframe_impl.cc',
         'webvideoframe_impl.h',
       ],
       'conditions': [
         ['inside_chromium_build==0', {
           'dependencies': [
             '<(DEPTH)/webkit/support/setup_third_party.gyp:third_party_headers',
           ],
         }],
         ['OS=="android"', {
           'sources!': [
             'audio_decoder.cc',
             'webmediaplayer_impl.cc',
             'webmediaplayer_impl.h',
           ],
         }],
       ],
     },
   ],
 }