fix build when ffmpeg, libvpx and libwebm are disabled

content/renderer/media/audio_decoder.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 "content/renderer/media/audio_decoder.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/strings/string_util.h"
@@ skipping 13 matching lines @@
 namespace content {
 
 // Decode in-memory audio file data.
 bool DecodeAudioFileData(
     blink::WebAudioBus* destination_bus,
     const char* data, size_t data_size) {
   DCHECK(destination_bus);
   if (!destination_bus)
     return false;
 
+#if !defined(MEDIA_DISABLE_FFMPEG)
   // Uses the FFmpeg library for audio file reading.
   InMemoryUrlProtocol url_protocol(reinterpret_cast<const uint8*>(data),
                                    data_size, false);
   AudioFileReader reader(&url_protocol);
 
   if (!reader.Open())
     return false;
 
   size_t number_of_channels = reader.channels();
   double file_sample_rate = reader.sample_rate();
@@ skipping 38 matching lines @@
 
   DVLOG(1) << "Decoded file data -"
            << " data: " << data
            << " data size: " << data_size
            << " duration: " << duration
            << " number of frames: " << actual_frames
            << " sample rate: " << file_sample_rate
            << " number of channels: " << number_of_channels;
 
   return actual_frames > 0;
+#else
+  return false;
+#endif

[xhwang, 2015/11/02 18:11:51]

#endif  // !defined(MEDIA_DISABLE_FFMPEG)

[Julien Isorce Samsung, 2015/11/03 16:02:27]

Acknowledged.

 }
 
 }  // namespace content