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

pkg/analyzer_experimental/test/generated/resolver_test.dart

 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.resolver_test;
 
 import 'dart:collection';
 import 'package:analyzer_experimental/src/generated/java_core.dart';
 import 'package:analyzer_experimental/src/generated/java_engine.dart';
 import 'package:analyzer_experimental/src/generated/java_junit.dart';
 import 'package:analyzer_experimental/src/generated/source_io.dart';
@@ skipping 2212 matching lines @@
     assertErrors([CompileTimeErrorCode.OVERRIDE_MISSING_NAMED_PARAMETERS]);
     verify([source]);
   }
   void fail_overrideMissingRequiredParameters() {
     Source source = addSource(EngineTestCase.createSource(["class A {", "  m(a) {}", "}", "class B extends A {", "  m(a, b) {}", "}"]));
     resolve(source, []);
     assertErrors([CompileTimeErrorCode.OVERRIDE_MISSING_REQUIRED_PARAMETERS]);
     verify([source]);
   }
   void fail_prefixCollidesWithTopLevelMembers() {
-    Source source = addSource(EngineTestCase.createSource(["import 'dart:uri' as uri;", "var uri = null;"]));
+    Source source = addSource(EngineTestCase.createSource(["import 'dart:uft' as utf;", "var utf = null;"]));
     resolve(source, []);
     assertErrors([CompileTimeErrorCode.PREFIX_COLLIDES_WITH_TOP_LEVEL_MEMBER]);
     verify([source]);
   }
   void fail_recursiveCompileTimeConstant() {
     Source source = addSource(EngineTestCase.createSource(["const x = y + 1;", "const y = x + 1;"]));
     resolve(source, []);
     assertErrors([CompileTimeErrorCode.RECURSIVE_COMPILE_TIME_CONSTANT]);
     verify([source]);
   }
@@ skipping 4514 matching lines @@
 //  LibraryImportScopeTest.dartSuite();
 //  LibraryScopeTest.dartSuite();
 //  ScopeTest.dartSuite();
 //  CompileTimeErrorCodeTest.dartSuite();
 //  ErrorResolverTest.dartSuite();
 //  NonErrorResolverTest.dartSuite();
 //  SimpleResolverTest.dartSuite();
 //  StaticTypeWarningCodeTest.dartSuite();
 //  StaticWarningCodeTest.dartSuite();
 //  TypePropagationTest.dartSuite();
-}
+}