Unifying compiler context

pkg/compiler/tool/generate_kernel.dart

Index: pkg/compiler/tool/generate_kernel.dart
diff --git a/pkg/compiler/tool/generate_kernel.dart b/pkg/compiler/tool/generate_kernel.dart
index 2ed2aa2680b5f8b6f947ea5ca6a5c445cd7ba8d9..1414ad549bbda460636d000fc3413b6d70d6883b 100644
--- a/pkg/compiler/tool/generate_kernel.dart
+++ b/pkg/compiler/tool/generate_kernel.dart
@@ -23,8 +23,8 @@ main(List<String> args) async {
     ..target = new Dart2jsTarget(new TargetFlags())
     ..packagesFileUri = Uri.base.resolve('.packages')
     ..compileSdk = true
-    ..linkedDependencies = [Uri.base.resolve(flags['platform'])]
-    ..onError = errorHandler;
+    ..setExitCodeOnProblem = true
+    ..linkedDependencies = [Uri.base.resolve(flags['platform'])];
 
   if (flags.rest.isEmpty) {
     var script = relativizeUri(Platform.script);
@@ -39,11 +39,6 @@ main(List<String> args) async {
   await writeProgramToBinary(program, flags['out']);
 }
 
-void errorHandler(CompilationError e) {
-  exitCode = 1;
-  print(e.message);
-}
-
 ArgParser _argParser = new ArgParser()
   ..addOption('platform',
       help: 'location of the precompiled dart2js sdk',