Removed fixed dependencies

packages/analyzer/lib/src/summary/base.dart

Index: packages/analyzer/lib/src/summary/base.dart
diff --git a/packages/analyzer/lib/src/summary/base.dart b/packages/analyzer/lib/src/summary/base.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7c3d8ae7448b9c792738e3484cac8bdaf461af84
--- /dev/null
+++ b/packages/analyzer/lib/src/summary/base.dart
@@ -0,0 +1,61 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/**
+ * Base functionality which code generated summary classes are built upon.
+ */
+library analyzer.src.summary.base;
+
+/**
+ * Annotation used in the summary IDL to indicate the id of a field.  The set
+ * of ids used by a class must cover the contiguous range from 0 to N-1, where
+ * N is the number of fields.
+ *
+ * In order to preserve forwards and backwards compatibility, id numbers must
+ * be stable between releases.  So when new fields are added they should take
+ * the next available id without renumbering other fields.
+ */
+class Id {
+  final int value;
+
+  const Id(this.value);
+}
+
+/**
+ * Instances of this class represent data that has been read from a summary.
+ */
+abstract class SummaryClass {
+  /**
+   * Translate the data in this class into a JSON map, whose keys are the names
+   * of fields and whose values are the data stored in those fields,
+   * recursively converted into JSON.
+   *
+   * Fields containing their default value are elided.
+   *
+   * Intended for testing and debugging only.
+   */
+  Map<String, Object> toJson();
+
+  /**
+   * Translate the data in this class into a map whose keys are the names of
+   * fields and whose values are the data stored in those fields.
+   *
+   * Intended for testing and debugging only.
+   */
+  Map<String, Object> toMap();
+}
+
+/**
+ * Annotation used in the summary IDL to indicate that a summary class can be
+ * the top level object in an encoded summary.
+ */
+class TopLevel {
+  /**
+   * If non-null, identifier that will be stored in bytes 4-7 of the file,
+   * prior all other file data.  Must be exactly 4 Latin1 characters.
+   */
+  final String fileIdentifier;
+
+  const TopLevel([this.fileIdentifier]);
+}