update AstBuilder to support part of <uri>

pkg/analyzer/test/generated/parser_fasta_test.dart

Index: pkg/analyzer/test/generated/parser_fasta_test.dart
diff --git a/pkg/analyzer/test/generated/parser_fasta_test.dart b/pkg/analyzer/test/generated/parser_fasta_test.dart
index 30d92ae2eb3b3b17b44c94a5e17a552bd3412ba8..ba8624bd3d83dce2f13b90f2519865c90775eefb 100644
--- a/pkg/analyzer/test/generated/parser_fasta_test.dart
+++ b/pkg/analyzer/test/generated/parser_fasta_test.dart
@@ -281,9 +281,8 @@ class FastaParserTestCase extends Object
 
   @override
   set enableUriInPartOf(bool value) {
-    if (value == true) {
-      // TODO(paulberry,ahe): URIs in "part of" declarations are not supported
-      // by Fasta.
+    if (value == false) {
+      // URIs in "part of" declarations cannot be disabled in Fasta.
       throw new UnimplementedError();

[kevmoo, 2017/08/16 20:36:29]

Nit: might be nice to actually put the content of the comment into the error we
throw? :-)

[danrubel, 2017/08/17 12:51:55]

Good point. Done.

     }
   }
@@ -999,24 +998,6 @@ class TopLevelParserTest_Fasta extends FastaParserTestCase
     super.test_parseDirectives_mixed();
   }
 
-  @override
-  @failingTest
-  void test_parsePartOfDirective_name() {
-    // TODO(paulberry,ahe): Thes test verifies that even if URIs in "part of"
-    // declarations are enabled, a construct of the form "part of identifier;"
-    // is still properly handled.  URIs in "part of" declarations are not
-    // supported by Fasta yet.
-    super.test_parsePartOfDirective_name();
-  }
-
-  @override
-  @failingTest
-  void test_parsePartOfDirective_uri() {
-    // TODO(paulberry,ahe): URIs in "part of" declarations are not supported by
-    // Fasta.
-    super.test_parsePartOfDirective_uri();
-  }
-
   @failingTest
   void test_parseCompilationUnit_operatorAsPrefix_parameterized2() {
     // TODO(danrubel): should not be generating an error