Use DiagnosticMessage in MockCompiler.

pkg/compiler/lib/src/apiimpl.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library leg_apiimpl;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:package_config/packages.dart';
@@ skipping 481 matching lines @@
         log('Total compile-time ${total}msec;'
             ' unaccounted ${total - cumulated}msec');
         return success;
       });
     });
   }
 
   void reportDiagnostic(DiagnosticMessage message,
                         List<DiagnosticMessage> infos,
                         api.Diagnostic kind) {
-    // TODO(johnniwinther): Move this to the [DiagnosticReporter]?
-    if (kind == api.Diagnostic.ERROR ||
-        kind == api.Diagnostic.CRASH ||
-        (reporter.options.fatalWarnings &&
-         kind == api.Diagnostic.WARNING)) {
-      compilationFailed = true;
-    }
     _reportDiagnosticMessage(message, kind);
     for (DiagnosticMessage info in infos) {
       _reportDiagnosticMessage(info, api.Diagnostic.INFO);
     }
   }
 
   void _reportDiagnosticMessage(DiagnosticMessage diagnosticMessage,
                                 api.Diagnostic kind) {
     // [:span.uri:] might be [:null:] in case of a [Script] with no [uri]. For
     // instance in the [Types] constructor in typechecker.dart.
@@ skipping 49 matching lines @@
   Uri lookupLibraryUri(String libraryName) {
     assert(invariant(NO_LOCATION_SPANNABLE,
         sdkLibraries != null, message: "setupSdk() has not been run"));
     return sdkLibraries[libraryName];
   }
 
   Uri resolvePatchUri(String libraryName) {
     return backend.resolvePatchUri(libraryName, platformConfigUri);
   }
 }