dart2js: Don't emit static const fields since they are inlined where they are used

sdk/lib/_internal/compiler/implementation/compile_time_constants.dart

 // Copyright (c) 2012, 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.
 
 part of dart2js;
 
 /**
  * The [ConstantHandler] keeps track of compile-time constants,
  * initializations of global and static fields, and default values of
  * optional parameters.
@@ skipping 211 matching lines @@
 
   /**
    * Returns an [Iterable] of static non final fields that need to be
    * initialized. The fields list must be evaluated in order since they might
    * depend on each other.
    */
   Iterable<VariableElement> getStaticNonFinalFieldsForEmission() {
     return initialVariableValues.keys.where((element) {
       return element.kind == ElementKind.FIELD
           && !element.isInstanceMember()
-          && !element.modifiers.isFinal();
+          && !element.modifiers.isFinal()
+          // The const fields are all either emitted elsewhere or inlined.
+          && !element.modifiers.isConst();
     });
   }
 
   /**
    * Returns an [Iterable] of static const fields that need to be initialized.
    * The fields must be evaluated in order since they might depend on each
    * other.
    */
   Iterable<VariableElement> getStaticFinalFieldsForEmission() {
     return initialVariableValues.keys.where((element) {
@@ skipping 634 matching lines @@
             // Use the default value.
             fieldValue = handler.compileConstant(field);
           }
           jsNewArguments.add(fieldValue);
         },
         includeBackendMembers: true,
         includeSuperMembers: true);
     return jsNewArguments;
   }
 }