Use common.dart to re-export commonly used entities.

pkg/compiler/lib/src/resolution/resolution_common.dart

Index: pkg/compiler/lib/src/resolution/resolution_common.dart
diff --git a/pkg/compiler/lib/src/resolution/resolution_common.dart b/pkg/compiler/lib/src/resolution/resolution_common.dart
index 1b0b6b5eb655df2d56a54c740188bc18a02c53a5..e1e0d283ebd85d6fa2c4a88bd4f151ef08f9f3f4 100644
--- a/pkg/compiler/lib/src/resolution/resolution_common.dart
+++ b/pkg/compiler/lib/src/resolution/resolution_common.dart
@@ -4,19 +4,13 @@
 
 library dart2js.resolution.common;
 
+import '../common.dart';
 import '../common/resolution.dart' show
     Resolution;
 import '../common/tasks.dart' show
     DeferredAction;
 import '../compiler.dart' show
     Compiler;
-import '../diagnostics/diagnostic_listener.dart' show
-    DiagnosticMessage,
-    DiagnosticReporter;
-import '../diagnostics/messages.dart' show
-    MessageKind;
-import '../diagnostics/spannable.dart' show
-    Spannable;
 import '../elements/elements.dart';
 import '../tree/tree.dart';