Remove KernelDriver/IKG.invalidateAll().

pkg/front_end/lib/incremental_kernel_generator.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/src/base/processed_options.dart';
 import 'package:front_end/src/incremental_kernel_generator_impl.dart';
 import 'package:kernel/kernel.dart';
 
@@ skipping 71 matching lines @@
   /// source code), the caller may consider the previous file state and the set
   /// of valid sources to be unchanged; this means that once the user fixes the
   /// errors, it is safe to call [computeDelta] again.
   Future<DeltaProgram> computeDelta();
 
   /// Remove the file associated with the given file [uri] from the set of
   /// valid files.  This guarantees that those files will be re-read on the
   /// next call to [computeDelta]).
   void invalidate(Uri uri);
 
-  /// Remove all source files from the set of valid sources.  This guarantees
-  /// that all files will be re-read on the next call to [computeDelta].
-  ///
-  /// Note that this does not erase the previous program state; the next time
-  /// [computeDelta] is called, if parts of the program are discovered to be
-  /// unchanged, parts of the previous program state will still be re-used to
-  /// speed up compilation.
-  void invalidateAll();
-
   /// Creates an [IncrementalKernelGenerator] which is prepared to generate
   /// kernel representations of the program whose main library is in the given
   /// [entryPoint].
   ///
   /// The initial "previous program state" is an empty program containing no
   /// code, and the initial set of valid sources is empty.  To obtain a kernel
   /// representation of the program, call [computeDelta].
   static Future<IncrementalKernelGenerator> newInstance(
       CompilerOptions options, Uri entryPoint,
       {WatchUsedFilesFn watch}) async {
     var processedOptions = new ProcessedOptions(options);
     var uriTranslator = await processedOptions.getUriTranslator();
     return new IncrementalKernelGeneratorImpl(
         processedOptions, uriTranslator, entryPoint,
         watch: watch);
   }
 }