Remove unused code from limited invalidation.

pkg/analyzer/lib/src/context/context.dart

Index: pkg/analyzer/lib/src/context/context.dart
diff --git a/pkg/analyzer/lib/src/context/context.dart b/pkg/analyzer/lib/src/context/context.dart
index 51e2c478867e7dac27e0caa7df38bac394dd99f0..ff230895e607973ecc9104a365a87d0751a541cc 100644
--- a/pkg/analyzer/lib/src/context/context.dart
+++ b/pkg/analyzer/lib/src/context/context.dart
@@ -1871,17 +1871,9 @@ class AnalysisContextImpl implements InternalAnalysisContext {
               unitEntry.setValueIncremental(
                   COMPILATION_UNIT_CONSTANTS, builder.unitConstants, false);
               DartDelta dartDelta = new DartDelta(source);
-              dartDelta.hasDirectiveChange = unitDelta.hasDirectiveChange;
               unitDelta.addedDeclarations.forEach(dartDelta.elementChanged);
               unitDelta.removedDeclarations.forEach(dartDelta.elementChanged);
               unitDelta.classDeltas.values.forEach(dartDelta.classChanged);
-              // Add other names in the library that are changed transitively.
-              {
-                ReferencedNames referencedNames = new ReferencedNames(source);
-                new ReferencedNamesBuilder(referencedNames).build(oldUnit);
-                dartDelta.addChangedElements(referencedNames, librarySource);
-              }
-              // Invalidate using the prepared DartDelta.
               entry.setState(CONTENT, CacheState.INVALID, delta: dartDelta);
               return;
             }