Revert "IMedia: Introduce a dummy isAvailable method"

This reverts commit d21a8761.

include/IMedia.h

@@ -66,7 +66,6 @@ class IMedia
         // This is likely to be used for album arts as well.
         virtual const std::string& snapshot() = 0;
         virtual unsigned int insertionDate() const = 0;
-        virtual bool isAvailable() const = 0;
 };
 
 #endif // IFILE_H

src/Media.cpp

@@ -232,11 +232,6 @@ unsigned int Media::insertionDate() const
     return m_insertionDate;
 }
 
-bool Media::isAvailable() const
-{
-    return true;
-}
-
 void Media::setSnapshot( const std::string& snapshot )
 {
     if ( m_snapshot == snapshot )

src/Media.h

@@ -93,7 +93,6 @@ class Media : public IMedia, public DatabaseHelpers<Media, policy::MediaTable>
         virtual std::vector<AudioTrackPtr> audioTracks() override;
         virtual const std::string& snapshot() override;
         virtual unsigned int insertionDate() const override;
-        virtual bool isAvailable() const override;
         void setSnapshot( const std::string& snapshot );
         bool save();