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

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

Index: pkg/front_end/lib/src/fasta/fasta.dart
diff --git a/pkg/front_end/lib/src/fasta/fasta.dart b/pkg/front_end/lib/src/fasta/fasta.dart
index 8a700879f34a0ccc735d9bc1d74991ad3fef3b0b..5385fa3480d80dc4ba694a40895c39fa6a10dcd1 100644
--- a/pkg/front_end/lib/src/fasta/fasta.dart
+++ b/pkg/front_end/lib/src/fasta/fasta.dart
@@ -150,7 +150,10 @@ class CompileTask {
     if (c.options.dumpIr && output != null) {
       printProgramText(outline);
     }
-    await kernelTarget.writeOutline(output);
+    if (output != null) {
+      await writeProgramToFileUri(ticker, output, outline,
+          isFullProgram: false);
+    }
     return kernelTarget;
   }
 
@@ -160,7 +163,7 @@ class CompileTask {
     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;
   }
 }