Revert r95841 due to failing media_unittests on linux_shared bot.

media/base/composite_data_source_factory.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.
 
 #ifndef MEDIA_BASE_COMPOSITE_DATA_SOURCE_FACTORY_H_
 #define MEDIA_BASE_COMPOSITE_DATA_SOURCE_FACTORY_H_
 
 #include <list>
 #include <set>
 
 #include "base/synchronization/lock.h"
 #include "media/base/async_filter_factory_base.h"
 
 namespace media {
 
-class MEDIA_EXPORT CompositeDataSourceFactory
-    : public AsyncDataSourceFactoryBase {
+class CompositeDataSourceFactory : public AsyncDataSourceFactoryBase {
  public:
   CompositeDataSourceFactory();
   virtual ~CompositeDataSourceFactory();
 
   // Add factory to this composite. Ownership is transferred here.
   void AddFactory(DataSourceFactory* factory);
 
   // DataSourceFactory method.
   virtual DataSourceFactory* Clone() const;
 
  protected:
   // AsyncDataSourceFactoryBase methods.
   virtual bool AllowRequests() const;
   virtual AsyncDataSourceFactoryBase::BuildRequest* CreateRequest(
       const std::string& url, BuildCallback* callback);
 
  private:
   class BuildRequest;
 
   typedef std::list<DataSourceFactory*> FactoryList;
   FactoryList factories_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositeDataSourceFactory);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_COMPOSITE_DATA_SOURCE_FACTORY_H_