Handle invalid URIs in summaries.

pkg/analyzer/lib/src/summary/uri.dart

+// Copyright (c) 2017, 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.
+
+/**
+ * Return `true` is the [uriStr] represents a syntactically correct URI.
+ */
+bool isValidUri(String uriStr) {

[Brian Wilkerson, 2017/02/01 21:02:10]

I can't see any uses of this function (probably just missing some), but there
are a lot of "on FormatException" wrappers in the code.

[scheglov, 2017/02/01 21:08:47]

You're right, we don't use it.
I will remove the file.

+  try {
+    Uri.parse(uriStr);
+    return true;
+  } on FormatException {
+    return false;
+  }
+}