Remove memento.

pkg/analyzer/lib/task/model.dart

Index: pkg/analyzer/lib/task/model.dart
diff --git a/pkg/analyzer/lib/task/model.dart b/pkg/analyzer/lib/task/model.dart
index 810d6cc47df33bab1ed4eb15a2c86c5a2c05841b..8f65f8bb1badbcc0421ad79b2d05a7f89f25425b 100644
--- a/pkg/analyzer/lib/task/model.dart
+++ b/pkg/analyzer/lib/task/model.dart
@@ -103,12 +103,6 @@ abstract class AnalysisTask {
   Map<String, dynamic> inputs;
 
   /**
-   * The optional data that the task associated with [target] last time.
-   * This data may help to compute outputs more efficiently.
-   */
-  Object inputMemento;
-
-  /**
    * A table mapping result descriptors whose values are produced by this task
    * to the values that were produced.
    */
@@ -116,12 +110,6 @@ abstract class AnalysisTask {
       new HashMap<ResultDescriptor, dynamic>();
 
   /**
-   * An optional data that the task wants to associate with [target].
-   * This data may help later to compute outputs more efficiently.
-   */
-  Object outputMemento;
-
-  /**
    * The exception that was thrown while performing this task, or `null` if the
    * task completed successfully.
    */
@@ -415,7 +403,7 @@ abstract class TaskDescriptor {
    * used to compute results based on the given [inputs].
    */
   AnalysisTask createTask(AnalysisContext context, AnalysisTarget target,
-      Map<String, dynamic> inputs, Object inputMemento);
+      Map<String, dynamic> inputs);
 }
 
 /**