Revert r95841 due to failing media_unittests on linux_shared bot.

media/base/seekable_buffer.h

 // 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.
 
 // SeekableBuffer to support backward and forward seeking in a buffer for
 // reading a media data source.
 //
 // In order to support backward and forward seeking, this class buffers data in
 // both backward and forward directions, the current read position can be reset
 // to anywhere in the buffered data.
@@ skipping 23 matching lines @@
 #define MEDIA_BASE_SEEKABLE_BUFFER_H_
 
 #include <list>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/buffers.h"
 
 namespace media {
 
-class MEDIA_EXPORT SeekableBuffer {
+class SeekableBuffer {
  public:
   // Constructs an instance with |forward_capacity| and |backward_capacity|.
   // The values are in bytes.
   SeekableBuffer(size_t backward_capacity, size_t forward_capacity);
 
   ~SeekableBuffer();
 
   // Clears the buffer queue.
   void Clear();
 
@@ skipping 110 matching lines @@
   // Keeps track of the most recent time we've seen in case the |buffers_| is
   // empty when our owner asks what time it is.
   base::TimeDelta current_time_;
 
   DISALLOW_COPY_AND_ASSIGN(SeekableBuffer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_SEEKABLE_BUFFER_H_