Remove dead code.

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 3452582b55b1f323f94ea0340c57eb65fa7aa99b..303101b8edf861b3ab38d86f8db829e137a35a32 100644
--- a/pkg/analyzer/lib/src/context/context.dart
+++ b/pkg/analyzer/lib/src/context/context.dart
@@ -1311,19 +1311,6 @@ class AnalysisContextImpl implements InternalAnalysisContext {
   }
 
   /**
-   * Return `true` if the given list of [sources] contains any of the given
-   * [targetSources].
-   */
-  bool _containsAny(List<Source> sources, List<Source> targetSources) {
-    for (Source targetSource in targetSources) {
-      if (_contains(sources, targetSource)) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  /**
    * Set the contents of the given [source] to the given [contents] and mark the
    * source as having changed. The additional [offset], [oldLength] and
    * [newLength] information is used by the context to determine what reanalysis