Remove artist commentary handling from download rewrite strategies.

app/logical/sources/strategies/base.rb

@@ -53,11 +53,6 @@ module Sources
         false
       end
 
-      # Determines whether or not to automatically create an ArtistCommentary
-      def has_artist_commentary?
-        false
-      end
-
       def normalize_for_artist_finder!
         url
       end

app/logical/sources/strategies/pixiv.rb

@@ -41,10 +41,6 @@ module Sources
         "http://www.pixiv.net"
       end
 
-      def has_artist_commentary?
-        @artist_commentary_desc.present?
-      end
-
       def normalized_for_artist_finder?
         url =~ %r!https?://img\.pixiv\.net/img/#{MONIKER}/?$!i
       end

app/logical/sources/strategies/pixiv_whitecube.rb

@@ -26,10 +26,6 @@ module Sources
         "http://www.pixiv.net"
       end
 
-      def has_artist_commentary?
-        @artist_commentary_desc.present?
-      end
-
       def normalizable_for_artist_finder?
         true
       end

app/logical/sources/strategies/twitter.rb

@@ -30,10 +30,6 @@ module Sources::Strategies
       @artist_commentary_desc = attrs[:text]
     end
 
-    def has_artist_commentary?
-      @artist_commentary_desc.present?
-    end
-
     def image_urls
       TwitterService.new.image_urls(url)
     end