Strong mode cleaning of many dart2js tests.

tests/compiler/dart2js/bad_output_io_test.dart

Index: tests/compiler/dart2js/bad_output_io_test.dart
diff --git a/tests/compiler/dart2js/bad_output_io_test.dart b/tests/compiler/dart2js/bad_output_io_test.dart
index 943a97d7923da2b81697675af697e983433383fb..68912d81bd3f9a337c178c6f14e01e430dd8219e 100644
--- a/tests/compiler/dart2js/bad_output_io_test.dart
+++ b/tests/compiler/dart2js/bad_output_io_test.dart
@@ -6,17 +6,19 @@
 
 library dart2js.test.bad_output_io;
 
-import 'dart:async';
 import 'dart:io' show exit;
 import 'package:expect/expect.dart';
 
 import 'package:compiler/compiler.dart' show Diagnostic;
-import 'package:compiler/compiler_new.dart' show OutputType;
+import 'package:compiler/compiler_new.dart'
+    show CompilerDiagnostics, CompilerInput, CompilerOutput, OutputType;
 import 'package:compiler/src/dart2js.dart'
     show exitFunc, compileFunc, compile, diagnosticHandler;
 import 'package:compiler/src/source_file_provider.dart'
     show FormattingDiagnosticHandler;
 
+import 'package:compiler/src/options.dart' show CompilerOptions;
+
 class CollectingFormattingDiagnosticHandler
     implements FormattingDiagnosticHandler {
   final provider = null;
@@ -56,7 +58,8 @@ class CollectingFormattingDiagnosticHandler
   int throwOnErrorCount;
 }
 
-testOutputProvider(options, input, diagnostics, output) {
+testOutputProvider(CompilerOptions options, CompilerInput input,
+    CompilerDiagnostics diagnostics, CompilerOutput output) {
   diagnosticHandler = new CollectingFormattingDiagnosticHandler();
   output.createOutputSink(
       "/non/existing/directory/should/fail/file", "js", OutputType.js);