Remove KernelDriver/IKG.invalidateAll().

pkg/front_end/lib/src/incremental_kernel_generator_impl.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 
 import 'package:front_end/incremental_kernel_generator.dart';
 import 'package:front_end/src/base/performace_logger.dart';
 import 'package:front_end/src/base/processed_options.dart';
 import 'package:front_end/src/fasta/uri_translator.dart';
@@ skipping 113 matching lines @@
 
       return new DeltaProgram(program);
     });
   }
 
   @override
   void invalidate(Uri uri) {
     _driver.invalidate(uri);
   }
 
-  @override
-  void invalidateAll() {
-    _driver.invalidateAll();
-  }
-
   /// TODO(scheglov) document
   Future<Null> _gc() async {
     var removedFiles = _driver.fsState.gc(_entryPoint);
     if (removedFiles.isNotEmpty && _watchFn != null) {
       for (var removedFile in removedFiles) {
         await _watchFn(removedFile.fileUri, false);
       }
     }
   }
 }
 
 @visibleForTesting
 class _TestView {
   final IncrementalKernelGeneratorImpl _generator;
 
   _TestView(this._generator);
 
   /// The [KernelDriver] that is used to actually compile.
   KernelDriver get driver => _generator._driver;
 }