Remove dart2jslib.dart

pkg/compiler/lib/src/common.dart

 // Copyright (c) 2013, 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 dart2js.common;
 
+
+export 'common/tasks.dart' show
+    CompilerTask;
+
+export 'compiler.dart' show
+    Compiler;
+
 export 'constants/values.dart' show
     ConstantValue,
     InterceptorConstantValue,
     NullConstantValue,
     TypeConstantValue;
 
-export 'dart2jslib.dart' show
-    CompilerTask,
-    Compiler,
-    invariant;
-
 export 'dart_types.dart' show
     DartType,
     FunctionType,
     InterfaceType,
     TypeVariableType,
     Types;
 
+export 'diagnostics/invariant.dart' show
+    invariant;
+
+export 'diagnostics/spannable.dart' show
+    SpannableAssertionFailure;
+
 export 'elements/elements.dart' show
     ClassElement,
     ClosureFieldElement,
     CompilationUnitElement,
     Element,
     Elements,
     FunctionElement,
     FunctionSignature,
     LibraryElement,
     MetadataAnnotation,
     MixinApplicationElement,
     TypedefElement,
     VariableElement;
 
 export 'resolution/resolution.dart' show
     TreeElements;
 
 export 'tree/tree.dart' show
     Node;
 
 export 'types/types.dart' show
     TypeMask;
 
 export 'universe/universe.dart' show
     CallStructure,
     Selector,
     SelectorKind;
 
 export 'util/util.dart' show
-    Link,
-    SpannableAssertionFailure;
+    Link;