Deprecate utility method

pkg/analyzer/lib/src/generated/engine.dart

Index: pkg/analyzer/lib/src/generated/engine.dart
diff --git a/pkg/analyzer/lib/src/generated/engine.dart b/pkg/analyzer/lib/src/generated/engine.dart
index 12af0b8122a71b62163bf008a086c5c0d2d599eb..0e32fe0e37863ff521f04418e2d78b081ebd49df 100644
--- a/pkg/analyzer/lib/src/generated/engine.dart
+++ b/pkg/analyzer/lib/src/generated/engine.dart
@@ -1158,12 +1158,12 @@ class AnalysisContextImpl implements InternalAnalysisContext {
       // performAnalysisTask() because re-caching one AST structure
       // can cause another priority source's AST structure to be flushed.
       //
+      // TODO(brianwilkerson) Remove this constraint when the new task model is
+      // implemented.
+      //
       int maxPriorityOrderSize = cacheSize - _PRIORITY_ORDER_SIZE_DELTA;
       if (_priorityOrder.length > maxPriorityOrderSize) {
-        List<Source> newPriorityOrder = new List<Source>(maxPriorityOrderSize);
-        JavaSystem.arraycopy(
-            _priorityOrder, 0, newPriorityOrder, 0, maxPriorityOrderSize);
-        _priorityOrder = newPriorityOrder;
+        _priorityOrder = _priorityOrder.sublist(0, maxPriorityOrderSize);
       }
     }
     this._options.analyzeFunctionBodiesPredicate =