Fix assert constructor initializer tests.

R=brianwilkerson@google.com
BUG=

Review-Url: https://codereview.chromium.org/2628143005 .

pkg/analyzer/lib/src/dart/analysis/file_state.dart

@@ -340,6 +340,7 @@ class FileState {
     LineInfo lineInfo = new LineInfo(scanner.lineStarts);
 
     Parser parser = new Parser(source, errorListener);
+    parser.enableAssertInitializer = analysisOptions.enableAssertInitializer;
     parser.parseGenericMethodComments = analysisOptions.strongMode;
     CompilationUnit unit = parser.parseCompilationUnit(token);
     unit.lineInfo = lineInfo;

pkg/analyzer/test/generated/compile_time_error_code_driver_test.dart

@@ -30,18 +30,6 @@ class CompileTimeErrorCodeTest_Driver extends CompileTimeErrorCodeTest {
     return super.test_fromEnvironment_bool_badDefault_whenDefined();
   }
 
-  @failingTest
-  @override
-  test_nonConstValueInInitializer_assert_condition() {
-    return super.test_nonConstValueInInitializer_assert_condition();
-  }
-
-  @failingTest
-  @override
-  test_nonConstValueInInitializer_assert_message() {
-    return super.test_nonConstValueInInitializer_assert_message();
-  }
-
   @failingTest
   @override
   test_prefixCollidesWithTopLevelMembers_functionTypeAlias() {