Fix Clang compile error.

media/audio/cras/cras_input.h

 // 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.
 
 #ifndef MEDIA_AUDIO_CRAS_CRAS_INPUT_H_
 #define MEDIA_AUDIO_CRAS_CRAS_INPUT_H_
 
 #include <cras_client.h>
 
 #include <string>
@@ skipping 83 matching lines @@
   // True if the stream has been started.
   bool started_;
 
   // ID of the playing stream.
   cras_stream_id_t stream_id_;
 
   // Direction of the stream.
   const CRAS_STREAM_DIRECTION stream_direction_;
 
   // Index of the CRAS device to stream input from.
-  uint32 pin_device_;
+  int pin_device_;
 
   // True if the stream is a system-wide loopback stream.
   bool is_loopback_;
 
   scoped_ptr<AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(CrasInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_CRAS_CRAS_INPUT_H_