1 files changed, 2 insertions, 33 deletions
diff --git a/activesupport/lib/active_support/testing/performance.rb b/activesupport/lib/active_support/testing/performance.rb
index 495fcea381..f6945e8466 100644
--- a/activesupport/lib/active_support/testing/performance.rb
+++ b/activesupport/lib/active_support/testing/performance.rb
@@ -235,44 +235,13 @@ module ActiveSupport
           end
         end
         
-        class ProcessTime < Time
-          # overridden by each implementation
-          def measure; end
-        end
-        
-        class WallTime < Time
-          # overridden by each implementation
-          def measure; end
-        end
-        
-        class CpuTime < Time
-          # overridden by each implementation
-          def measure; end
-        end
-        
-        class Memory < Base
-          # overridden by each implementation
-          def measure; end
-            
+        class DigitalInformationUnit < Base
           def format(measurement)
             number_to_human_size(measurement, :precision => 2)
           end
         end
         
-        class Objects < Amount
-          # overridden by each implementation
-          def measure; end
-        end
-
-        class GcRuns < Amount
-          # overridden by each implementation
-          def measure; end
-        end
-
-        class GcTime < Time
-          # overridden by each implementation
-          def measure; end
-        end
+        # each implementation provides its own metrics like ProcessTime, Memory or GcRuns
       end
     end
   end