Merge the dart:uri library into dart:core and update the Uri class

pkg/analyzer_experimental/lib/src/generated/resolver.dart

Index: pkg/analyzer_experimental/lib/src/generated/resolver.dart
diff --git a/pkg/analyzer_experimental/lib/src/generated/resolver.dart b/pkg/analyzer_experimental/lib/src/generated/resolver.dart
index fc7b84d16f33e328f44b400c28a9d9a7c25ec549..55ef00785a21bec8efd8328cecb18ddd9208fd1a 100644
--- a/pkg/analyzer_experimental/lib/src/generated/resolver.dart
+++ b/pkg/analyzer_experimental/lib/src/generated/resolver.dart
@@ -4,7 +4,6 @@
 library engine.resolver;
 
 import 'dart:collection';
-import 'dart:uri' show Uri;
 import 'java_core.dart';
 import 'java_engine.dart';
 import 'instrumentation.dart';
@@ -880,7 +879,7 @@ class HtmlUnitBuilder implements ht.XmlVisitor<Object> {
         ExternalHtmlScriptElementImpl script = new ExternalHtmlScriptElementImpl(node);
         if (scriptSourcePath != null) {
           try {
-            new Uri(scriptSourcePath);
+            Uri.parse(scriptSourcePath);
             Source scriptSource = _context.sourceFactory.resolveUri(htmlSource, scriptSourcePath);
             script.scriptSource = scriptSource;
             if (!scriptSource.exists()) {
@@ -8417,4 +8416,4 @@ class ResolverErrorCode implements Comparable<ResolverErrorCode>, ErrorCode {
   bool needsRecompilation() => true;
   int compareTo(ResolverErrorCode other) => __ordinal - other.__ordinal;
   String toString() => __name;
-}
+}