Put constants in 'C', not '$'.

dart/sdk/lib/_internal/compiler/implementation/js_backend/namer.dart

 // Copyright (c) 2011, 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 js_backend;
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class Namer implements ClosureNamer {
@@ skipping 127 matching lines @@
     "Input", "JSObject", "KeyEvent", "Link", "Location", "MimeType",
     "MouseEvent", "Navigator", "Node", "NodeList", "Option", "Plugin",
     "ProcessingInstruction", "Range", "RangeException", "Screen", "Select",
     "Table", "TableCell", "TableRow", "TableSelection", "Text", "TextArea",
     "UIEvent", "Window", "XMLHttpRequest", "XMLSerializer",
     "XPathException", "XPathResult", "XSLTProcessor",
 
     // These keywords trigger the loading of the java-plugin. For the
     // next-generation plugin, this results in starting a new Java process.
     "java", "Packages", "netscape", "sun", "JavaObject", "JavaClass",
-    "JavaArray", "JavaMember"
+    "JavaArray", "JavaMember",
+
+    // Global object for constants.
+    "C",
   ];
 
   Set<String> _jsReserved = null;
   /// Names that cannot be used by members, top level and static
   /// methods.
   Set<String> get jsReserved {
     if (_jsReserved == null) {
       _jsReserved = new Set<String>();
       _jsReserved.addAll(javaScriptKeywords);
       _jsReserved.addAll(reservedPropertySymbols);
@@ skipping 609 matching lines @@
   }
 
   String isolateLazyInitializerAccess(Element element) {
     return "$CURRENT_ISOLATE.${getLazyInitializerName(element)}";
   }
 
   String isolateStaticClosureAccess(Element element) {
     return "$CURRENT_ISOLATE.${getStaticClosureName(element)}";
   }
 
+  String globalObjectForConstant(Constant constant) => 'C';
+
   String operatorIsPrefix() => r'$is';
 
   String operatorAsPrefix() => r'$as';
 
   String operatorSignature() => r'$signature';
 
   String functionTypeTag() => r'func';
 
   String functionTypeVoidReturnTag() => r'void';
 
@@ skipping 474 matching lines @@
         if (!first) {
           sb.write('_');
         }
         sb.write('_');
         visit(link.head);
         first = true;
       }
     }
   }
 }