Remove making added files as changed.

pkg/analyzer/lib/src/dart/analysis/driver.dart

Index: pkg/analyzer/lib/src/dart/analysis/driver.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/driver.dart b/pkg/analyzer/lib/src/dart/analysis/driver.dart
index 06dc54f6b2f11782a37c07acc24a3172ace7fcd9..4c7041cacb889b2ae9fa74f157e5b1457d09e3d1 100644
--- a/pkg/analyzer/lib/src/dart/analysis/driver.dart
+++ b/pkg/analyzer/lib/src/dart/analysis/driver.dart
@@ -386,7 +386,6 @@ class AnalysisDriver {
   void addFile(String path) {
     if (AnalysisEngine.isDartFileName(path)) {
       _addedFiles.add(path);
-      _changedFiles.add(path);
       _filesToAnalyze.add(path);
     }
     _statusSupport.transitionToAnalyzing();