pkg/compiler: fix imports

pkg/compiler/lib/compiler_new.dart

 // Copyright (c) 2015, 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.
 
 /// New Compiler API. This API is under construction, use only internally or
 /// in unittests.
 
 library compiler_new;
 
 import 'dart:async';
+
+import 'compiler.dart' show Diagnostic;
 import 'src/apiimpl.dart';
 import 'src/options.dart' show CompilerOptions;
 
-import 'compiler.dart' show Diagnostic;
 export 'compiler.dart' show Diagnostic, PackagesDiscoveryProvider;
 
 // Unless explicitly allowed, passing `null` for any argument to the
 // methods of library will result in an Error being thrown.
 
 /// Interface for providing the compiler with input. That is, Dart source files,
 /// package config files, etc.
 abstract class CompilerInput {
   /// Returns a future that completes to the source corresponding to [uri].
   /// If an exception occurs, the future completes with this exception.
@@ skipping 93 matching lines @@
   if (compilerOutput == null) {
     throw new ArgumentError("compilerOutput must be non-null");
   }
 
   CompilerImpl compiler = new CompilerImpl(
       compilerInput, compilerOutput, compilerDiagnostics, compilerOptions);
   return compiler.run(compilerOptions.entryPoint).then((bool success) {
     return new CompilationResult(compiler, isSuccess: success);
   });
 }