Move writeOutline() and writeProgram() out of KernelTarget.

pkg/front_end/lib/src/fasta/fasta.dart

 // Copyright (c) 2016, 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 fasta;
 
 import 'dart:async' show Future;
 
 import 'dart:convert' show JSON;
 
@@ skipping 132 matching lines @@
     if (path.endsWith(".dart")) {
       kernelTarget.read(uri);
     } else {
       inputError(uri, -1, "Unexpected input: $uri");
     }
     await dillTarget.buildOutlines();
     var outline = await kernelTarget.buildOutlines();
     if (c.options.dumpIr && output != null) {
       printProgramText(outline);
     }
-    await kernelTarget.writeOutline(output);
+    if (output != null) {
+      await writeProgramToFileUri(ticker, output, outline,
+          isFullProgram: false);
+    }
     return kernelTarget;
   }
 
   Future<Uri> compile() async {
     KernelTarget kernelTarget = await buildOutline();
     if (exitCode != 0) return null;
     Uri uri = c.options.output;
     var program = await kernelTarget.buildProgram(verify: c.options.verify);
     if (c.options.dumpIr) printProgramText(program);
-    await kernelTarget.writeProgram(uri);
+    await writeProgramToFileUri(ticker, uri, program, isFullProgram: true);
     return uri;
   }
 }
 
 Future<CompilationResult> parseScript(
     Uri fileName, Uri packages, Uri patchedSdk,
     {bool verbose: false, bool strongMode: false}) async {
   return parseScriptInFileSystem(
       fileName, PhysicalFileSystem.instance, packages, patchedSdk,
       verbose: verbose, strongMode: strongMode);
@@ skipping 114 matching lines @@
   final BytesBuilder builder = new BytesBuilder();
 
   void add(List<int> data) {
     builder.add(data);
   }
 
   void close() {
     // Nothing to do.
   }
 }