fix build when ffmpeg, libvpx and libwebm are disabled

media/blink/webmediaplayer_impl.cc

 // Copyright 2013 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/blink/webmediaplayer_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <string>
@@ skipping 940 matching lines @@
   DCHECK(main_task_runner_->BelongsToCurrentThread());
 
   Demuxer::EncryptedMediaInitDataCB encrypted_media_init_data_cb =
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnEncryptedMediaInitData);
 
   // Figure out which demuxer to use.
   if (load_type_ != LoadTypeMediaSource) {
     DCHECK(!chunk_demuxer_);
     DCHECK(data_source_);
 
+#if !defined(MEDIA_DISABLE_FFMPEG)
     demuxer_.reset(new FFmpegDemuxer(media_task_runner_, data_source_.get(),
                                      encrypted_media_init_data_cb, media_log_));
+#else
+    OnPipelineError(PipelineStatus::DEMUXER_ERROR_COULD_NOT_OPEN);
+    return;
+#endif
   } else {
     DCHECK(!chunk_demuxer_);
     DCHECK(!data_source_);
 
     chunk_demuxer_ = new ChunkDemuxer(
         BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnDemuxerOpened),
         encrypted_media_init_data_cb, media_log_, true);
     demuxer_.reset(chunk_demuxer_);
   }
 
@@ skipping 133 matching lines @@
            << ", Video: " << stats.video_memory_usage << ", DataSource: "
            << (data_source_ ? data_source_->GetMemoryUsage() : 0)
            << ", Demuxer: " << (demuxer_ ? demuxer_->GetMemoryUsage() : 0);
 
   const int64_t delta = current_memory_usage - last_reported_memory_usage_;
   last_reported_memory_usage_ = current_memory_usage;
   adjust_allocated_memory_cb_.Run(delta);
 }
 
 }  // namespace media