Implement AstBuilder support for `void` keyword.

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 831fcffd8d8576c45eab3a8ec87fdd03eaf1925b..5797c2a6cc75daba6df2e3686ac919437f8985c5 100644
--- a/pkg/analyzer/test/generated/parser_fasta_test.dart
+++ b/pkg/analyzer/test/generated/parser_fasta_test.dart
@@ -595,20 +595,6 @@ class TopLevelParserTest_Fasta extends FastaParserTestCase
 
   @override
   @failingTest
-  void test_parseCompilationUnitMember_function_generic_void() {
-    // TODO(paulberry): Unhandled event: VoidKeyword
-    super.test_parseCompilationUnitMember_function_generic_void();
-  }
-
-  @override
-  @failingTest
-  void test_parseCompilationUnitMember_function_void() {
-    // TODO(paulberry): Unhandled event: VoidKeyword
-    super.test_parseCompilationUnitMember_function_void();
-  }
-
-  @override
-  @failingTest
   void test_parseCompilationUnitMember_getter_external_noType() {
     // TODO(paulberry): Implement AstBuilder.handleModifier
     super.test_parseCompilationUnitMember_getter_external_noType();
@@ -631,19 +617,12 @@ class TopLevelParserTest_Fasta extends FastaParserTestCase
   @override
   @failingTest
   void test_parseCompilationUnitMember_setter_external_type() {
-    // TODO(paulberry): Unhandled event: VoidKeyword
+    // TODO(paulberry): Implement AstBuilder.handleModifier
     super.test_parseCompilationUnitMember_setter_external_type();
   }
 
   @override
   @failingTest
-  void test_parseCompilationUnitMember_setter_type() {
-    // TODO(paulberry): Unhandled event: VoidKeyword
-    super.test_parseCompilationUnitMember_setter_type();
-  }
-
-  @override
-  @failingTest
   void test_parseCompilationUnitMember_typeAlias_abstract() {
     // TODO(paulberry,ahe): Capture `=` token
     super.test_parseCompilationUnitMember_typeAlias_abstract();
@@ -849,7 +828,7 @@ class TopLevelParserTest_Fasta extends FastaParserTestCase
   @override
   @failingTest
   void test_parseTypeAlias_function_voidReturnType() {
-    // TODO(paulberry): Unhandled event: VoidKeyword
+    // TODO(paulberry): Unhandled event: FunctionTypeAlias
     super.test_parseTypeAlias_function_voidReturnType();
   }